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5639850 |
Process for preparing a tough, soluble, aromatic, thermoplastic copolyimide
A process for preparing a tough, soluble, aromatic, thermoplastic copolyimide is provided. The process comprises the steps of (a) providing 4,4'-oxydiphthalic anhydride to...
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5635584 |
Process including glycolysis and subsequent purification for recycling polyester materials
A new process is described for recycling polyesters. In accordance with the described process, postconsumer or scrap polyester is reacted with glycol to produce a monomer or low molecular weight...
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5633339 |
Use of tertiary aliphatic monocarboxylic acids as chain terminators for the preparation of polycarbonates and of polyester carbonates
The present invention relates to the use of special monocarboxylic acids as chain terminators for the preparation of polycarbonates and of polyester carbonates, and to the polycarbonates and...
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5633340 |
Polyester molding compositions
This invention relates to a molded object prepared from a copolyester having an inherent viscosity of 0.4 to 1.1 dL/g, wherein the acid component comprises repeat units from 90 to 40 mole %...
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5629404 |
Impact resistant polymers based on bisphenol-A-polycarbonate
A high impact polymer comprising repeating monomer units of the formula: ##STR1## wherein R 2 and R 2 are substituents selected from the group consisting of hydrogen, an alkyl group, an aryl ring...
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5627255 |
Poly(arylester-carbonate)s and a process for the preparation of poly(arylester-carbonate)s
Novel poly(arylester-carbonate)s of the formula ##STR1## are disclosed, as well a process for preparing such poly(arylester-carbonate)s.
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5621067 |
Wholly aromatic polyamides with improved flame resistance
Wholly aromatic polyamides and their shaped articles containing at least 85 mole percent of repeat units of m-phenylene isophthalamide: ##STR1## and repeat units of selected aromatic diamines and...
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5614606 |
Polyamic acids and polyimides
Polyamic acids and corresponding polyimides are prepared by reacting polyfunctional amines, aromatic polyfunctional anhydrides or esters thereof, and allyl-nadic anhydride end capping agents, the...
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5612444 |
Process for making polyetheresters with high aromatic ester content
A two-step process for making polyetherester resins is disclosed. A low molecular weight polyol reacts with an aromatic dicarboxylic acid in step one to produce a polyester intermediate. In step...
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5610261 |
Adamantane based three-dimensional rigid-rod polymers
High compressive strength, three-dimensional para-oriented benzobisoxazole polymers of the formula: ##STR1## wherein Q is ##STR2## and wherein Z represents repeating units of the formula: ##STR3##
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5608033 |
Liquid crystal alignment film
A liquid crystal alignment film made of a polyimide which has, on its side chain, a benzene or biphenyl ring substituted by a monovalent substituent having a positive value as the σp value under...
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5606007 |
Processes for preparing aromatic polycarbonates
According to the present invention, there is provided an improvement which comprises adding an acid compound and if necessary an epoxy compound to a reaction product resulting from melt...
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5606009 |
Copolymerized polycarbonates
The present invention provides copolymerized copolyester-carbonates having improved flow and formability, in addition to excellent mechanical properties, heat resistance, transparency, and water...
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5606012 |
Polyetheramidoamine hydrogels as heparinizable materials
Polymeric polyetheramidoamine hydrogel materials, which are capable of complexing heparin in physiological conditions are herein described. Said materials are useful in the manufacturing of medical...
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5606014 |
Imide oligomers and co-oligomers containing pendent phenylethynyl groups and polymers therefrom
Controlled molecular weight imide oligomers and co-oligomers containing pendent phenylethynyl groups (PEPIs) and endcapped with nonreactive or phenylethynyl groups have been prepared by the...
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5602226 |
Method of making multidimensional polyesters
The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide...
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5594092 |
Process for manufacturing polyester copolymers
This invention is an improved process for producing polyester copolymers, which employs a combination of an acid-based process and an ester-based process. The ester-based process is used to...
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5591809 |
Process for preparing hyperbranched polymers
The present invention provides novel one-step processes for preparing highly branched macromolecule polymers that have highly controlled molecular architectures. The process comprises the reaction...
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5587007 |
Modified dicyclopentadiene resins
The specification describes a method for preparing a phenol-modified dicyclopentadiene resin. The method comprises reacting (a) dicyclopentadiene, (b) a phenol selected from the group consisting of...
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5587452 |
Polyamide-imide
The invention relates to a polyamide-imide containing recurring units according to the formula ##STR1## where Y is an arylene group, and R and R' are alkylene groups, in which at least 50 mole %...
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5580950 |
Negative birefringent rigid rod polymer films
A class of soluble polymers having a rigid rod backbone, which when used to cast films, undergo a self-orientation process whereby the polymer backbone becomes more or less aligned parallel to the...
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5578697 |
Polyimide precursor, bismaleimide-based cured resin precursor and electronic parts having insulating members made from these precursors
A polyimide precursor having a molecular structure obtained by polymerizing (a) 0.97 to 1.03 molar equivalent of a diamine component containing 0.40 molar equivalent or more of aromatic diamine...
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5578696 |
Heat resistant adhesive film, an adhesion structure, and method of adhesion
A heat-resistant adhesive film, an adhesion structure obtained using the same, and an adhesion method using the same are disclosed, the film comprising a polyisoimide resin containing at least 40...
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5571890 |
Polyetheramidoamine superabsorbent hydrogels
Polyetheramidoamine hydrogels consisting of polyetheramidomaine and/or polyamidoamine prepolymers crosslinked by Michael's nuceophilic polyaddition with alpha-omega-diamino monomers or with...
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5569738 |
Melt processable etherimideimide/etherimide copolymer
This invention relates to melt processable copolymer of etherimideimide/etherimide herein-after identified as PEII/PEI copolymer of following structural formula(I). ##STR1## wherein, R and R' are...
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5567800 |
Imide oligomers endcapped with phenylethynyl phthalic anhydrides and polymers therefrom
Controlled molecular weight phenylethynyl terminated imide oligomers (PETIs) have been prepared by the cyclodehydration of precursor phenylethynyl terminated amic acid oligomers. Amino terminated...
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5563223 |
Coating resin compositions
A coat resin composition comprising a polyester (A) comprising an acid component comprising an aromatic dicarboxylic acid in a proportion of 50-100% by mole relative to the entire acid component...
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5561183 |
Preparation method of antibacterial and deodorant polyester for fiber
Antibacterial and deodorant polyester for fiber which is much improved in melt viscosity, is prepared by adding the melt viscosity enhancers represented by the following general formulas I to IV...
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5550205 |
Copolycarbonates and manufacturing method for them
To provide novel polycarbonates and a manufacturing method for them. Copolycarbonates obtained by copolymerizing at least two aromatic dihydroxy compounds and a compound capable of introducing...
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5545681 |
pH-Modified polymer compositions with enhanced biodegradability
Polymer compositions having enhanced biodegradability are disclosed. The compositions comprise a blend of: (1) a polymer containing hydrolyzable bonds; and (2) a substantially water-insoluble,...
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5541282 |
Aromatic polyhydroxy compounds and process for the preparation thereof
The invention involves aromatic polyhydroxy compounds, including triaromatic bisphenols and tris-[1,1,1-(4-hydroxyphenyl)] toluenes, and a process for the preparation thereof by reacting a phenolic...
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5534613 |
Benzobisazole polymers containing triarylamino moieties
Polymers of the class rigid-rod aromatic heterocyclic polymers, having repeating units of the formula: ##STR1## wherein R is selected from the group consisting of --H, --CH 3 , --N(CH 3 ) 2 and...
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5530086 |
Polyester containing 9,9-bis(4-(2-hydroxyalkoxy)phenyl fluorene
Provided is a polyester from 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorenes as a diol component, and this novel polymer is excellent in transparency and heat resistance, has small optical anisotropy,...
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5521277 |
Benzobisazole copolymers containing triarylamino moieties
A copolymer having repeating units of the formula: ##STR1## wherein R is selected from the group consisting of --H, --CH 3 , --N(CH 3 ) 2 and --OH, x has a value of 0.01 to 0.99 and Q is ##STR2##...
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5519108 |
Catalytic compositions containing tetrabutyl titanate and a mixture of cocatalysts for the preparation of poly(butylene terephthalate)
A catalyst composition for use in the preparation of poly(butylene terephthalate) from dimethyl terephthalate, comprising: (a) a titanium compound primary catalyst, from about 0.0005 PHR to about 5...
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5516875 |
Positive-working photodefinable polyimide precursors
This invention concerns positive-working photodefinable polyimide precursors which make use of chemical amplification based on photoacid catalyzed cleavage of acid labile-poly(amic acetal esters).
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5516566 |
Cyclic oligomers for production of linear polyketones, polyphthalazines and polyisoquinolines
Low molecular weight cyclic oligomers of formula (I) ##STR1## in which n is an integer of 2 to 20, and each C in the oligomer is a radical of formula (II): ##STR2## and each X in the oligomer is...
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5516876 |
Polyimide oligomers and blends
Polyimide oligomers include (1) linear, monofunctional crosslinking oligomers prepared by condensing a monoanhydride end cap with a diamine that includes alternating ether and "sulfone" (--SO 2 ...
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5516879 |
Catalytic compositions for the preparation of poly(butylene terephthalate)
A catalyst composition for use in the preparation of poly(butylene terephthalate) from dimethyl terephthalate, comprising: (a) a titanium compound primary catalyst, from about 0.01 PHR to about 1...
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5516877 |
Crosslinkable carbonate polymers of dihydroxyaryl fluorene
There are disclosed carbonate polymers of dihydroxyaryl fluorene having crosslinkable moieties. There are also disclosed such polymers in the form of composites. The polymers of this invention are...
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5512632 |
Thermoplastic blends containing polyesters and polyester carbonates based on substituted cycloalkylidene bisphenols
The invention relates to mixtures of special polyesters and/or special polyester carbonates with amorphous thermoplastics and/or with partly crystalline thermoplastics and/or with rubbers and/or...
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5510448 |
Copolyestercarbonate composition derived from dihydricphenol, carbonate precursor and alpha omega-dicarboxylic acid
A composition comprising a copolyestercarbonate derived from a dihydric phenol, a carbonate precursor, and an aliphatic alpha omega dicarboxylic acid or ester precursor wherein the dicarboxylic...
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5510182 |
Copolyestercarbonate composition derived from dihydric phenol, carbonate precursor and an alpha omega dicarboxylic acid
A composition comprising a copolyestercarbonate derived from a dihydric phenol, a carbonate precursor, and an aliphatic alpha omega dicarboxylic acid or ester precursor wherein the dicarboxylic...
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5510450 |
Method of producing copolymerized polycarbonates
The object of the present invention is to provide a method of producing copolymerized polycarbonates having improved flow and formability, in addition to excellent mechanical properties, heat...
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5508377 |
Polyimide
This invention relates to a novel polyimide or polyimide copolymer having excellent heat resistance and greatly improved processability, and has a novel aromatic diamino compound used for the...
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5506060 |
Method for making multidimensional ether or ester oligomers
Crosslinkable, polyaromatic, polyether or polyester oligomers can have glass transition temperatures above 900° F. while exhibiting desirable toughness for aerospace applications and ease of...
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5503934 |
Metallized plastic article
It is possible to manufacture articles out of thermoplastic materials and to metallize the articles at their surface. In this way one can manufacture reflectors and similar articles. Most...
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5502156 |
Electrically conducting polyimide film containing tin complexes
Disclosed is a thermally-stable SnO 2 -surfaced polyimide film wherein the electrical conductivity of the SnO 2 surface is within the range of about 3.0×10 -3 to about 1×10 -2 ohms -1 ,. Also...
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5498690 |
Use of polycondensation products, and novel polycondensation products
Carboxyl-containing polycondensation products having glass transition temperatures T G ≥20° C. obtained from anhydrides of tricarboxylic or tetracarboxylic acids and diols, diamines or amino...
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5496915 |
Polyimides based on diamines containing cycloaliphatic units
Polyimides are obtainable by reacting a dianhydride component with a diamine component, at least one diamine containing cycloaliphatic units, with the proviso that the dianhydride component is a...
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