The Upjohn Co.

The Dow Chemical Company

Kemal B Onder

Augustin T Chen

Robert G Nelb, Ii

David J Goldwasser

Steven J Grossman

Karl W Rausch, Jr

Philip S Andrews

Shenghong A Dai

Edward F Cassidy

Curtis P Smith

Laura Bauerle Weaver

Edward A Barsa

William J Farrissey, Jr

Frank P Recchia

Keith G Saunders

John A Vanderlip

Disclosed is a process for the preparation of a thermoplastic polymer blend comprising a first preformed thermoplastic polymer such as a polyester, polycarbonate, ABS graft polymer and the like and a second thermoplastic polyamide or polyamideimide. The second polymer is prepared from a diisocyanate and polycarboxylic compund selected from a dicarboxylic acid, tricarboxylic acid or anhydride thereof, or mixtures of these components by reactively processing the monomer components in the presence of the first polymer.

Polyamide blends by reactive processing

Disclosed are homogeneous blends comprising (a) a poly(alkylene terephthalate) and (b) a sufficient amount of a crystalline polyamide to impart enhanced crystallization velocity to said polyalkylene terephthalate. The crystalline polyamide comprises a narrow class of aromatic-aliphatic polyamides prepared from 4,4'-methylenebis(phenyl isocyanate) and a small group of aliphatic dicarboxylic acids. the poly(alkylene terephthalates) are characterized by enhanced crystallization rates which lead to a number of improved properties over the base polyester.

Poly(alkylene terephthalate) compositions having improved

Disclosed are novel blends comprising segmented polyesteramides with minor amounts of carbodiimide containing materials. The blends are characterized by excellent physical properties and improved compression set characteristics over the polyesteramides in the absence of the carbodiimide component. This allows the polymers obtained to find utility in the making of seals or gaskets which heretofore the base polyesteramides could not satisfy.

Polyesteramide and sufficient carbodiimide to impart improved

Flame-retardant blends are provided comprising a particular type of aromatic-aliphatic copolyamide and a flame-retardant amount of an oligomeric or polymeric halogenated aromatic polycarbonate. The blends are characterized by being transparent and meeting the V-O rating when tested in accordance with the Underwriters Laboratories UL-94 vertical burn test.

Flame retarded polyamide compositions

Novel polyamide block copolymers are provided which comprise a central block of a soft segment derived from the residue of a polymeric polyol or polycarboxylic acid joined to terminal hard segment polyamide blocks. The linkages which join the blocks are of a novel type and are the opened form of certain monoazetidine-2,4-dione rings. The block copolymers can be prepared very rapidly via anionically polymerizing lactams on to prepolymer soft segments containing terminal azetidine-2,4-dione rings. The speed with which the polymerizations can be carried out make the block copolymers particularly useful for the RIM preparation of molded parts.

Azetidinedione-monocarbonamide capped prepolymer

A process is described for increasing the molecular weights of thermoplastic polyamides and polyesteramides by fluxing and homogenizing the subject polymers which have been prepared by the reaction of an organic diisocyanate and a dicarboxylic acid with an effective amount of an organic diisocyanate reagent at a temperature of at least about 150.degree. C.

Method for increasing the molecular weight of polyamides and

Substantially linear, segmented polyester-amides are disclosed which contain aromatic residues in the hard segments and as soft segments the residues of polycarbonate diols of molecular weight from about 400 to about 4000. The polymers are characterized by the unexpected combination of excellent hydrolytic stability, thermal stability, and low temperature flexibility.

Polyamide-poly-carbonate block copolymers

Blends are provided comprising (a) from about 25 to about 75 percent by weight of a particular aromatic-aliphatic polyamide and (b) complementally 75 to 25 percent by weight of a particular polyetherimide.

Polyamide/polyetherimide alloys

Novel polyamide block copolymers are provided which comprise a central block of a soft segment derived from the residue of a polymeric polyol or polyamine joined to terminal hard segment polyamide blocks. The linkages which join the blocks are of a novel type and are the opened form of certain bis azetidine-2,4-dione rings. The block copolymers can be prepared very rapidly via anionically polymerizing lactams on to prepolymer soft segments containing terminal azetidine-2,4-dione rings. The speed with which the polymerizations can be carried out make the block copolymers particularly useful for the RIM preparation of molded parts.

Polymer from azetidine-2,4-dione and polyol or polyamine

Disclosed are novel blends comprising segmented polyesteramides with minor amounts of aliphatic polyamides. The blends are characterized by good physical properties including improved elongation and solvent resistance over the base polyesteramides. The polymers so obtained find utility in the making of seals, gaskets, bushings, and the like.

Blends of polyesteramides and polyamides

Blends are provided of (a) certain aromatic-aliphatic polyamides and (b) an impact resistance-enhancing amount of a particulate rubbery impact modifier.

Polymer blends

Polyamide block copolymer from lactam and azetidine-2,4-dione

The impact resistance and crystallization velocity of polyalkylene terephthalates (polyethylene and polybutylene terephthalates in particular) are improved significantly by blending said polyesters with a minor amount of a segmented polyesteramide.

Disclosed are injection moldable, rapidly crystallizable compositions comprising (A) a linear polyamide selected from the series poly(4,4'-methylenediphenylene azelamide to dodecanediamide); and (B) an amount sufficient to promote the crystallization of the linear polyamide, of a material selected from the group of (i) talc, (ii) sodium benzenesulfonate, (iii) a polyethylene ionomer, (iv) a methacrylated butadiene-styrene, and (v) a multi-phase composite interpolymer. The compositions crystallize rapidly from the molten state which allows for economically attractive molding procedures including fiber production and the production of aromatic-aliphatic polyamides having a combination of excellent properties.

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North Haven, CT, United States of America

Kemal B Onder