Toughened nylon compositions with improved flow and processes for their preparation
OwnerRolando Umali Pagilagan, Robert Benham Fish JR.inventors
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Abstract
Rubber-toughened and ionomer-toughened polyamide compositions are provided which exhibit decreased molecular weight in comparison with conventional systems but without compromising the toughness of the system. Processes for their preparation are also provided, in which excess organic acid is incorporated into the polyamide-functionalized rubber system.
Claims19
A toughened polyamide composition comprising:
- (a) 40-94 percent by weight polyamide;
- (b) 6-60 percent by weight toughener having a tensile modulus of about 5.0 to 20,000 p.s.i. and wherein the ratio of the tensile modulus of the polyamide to the tensile modulus of the toughener is greater than 20 to 1, wherein the toughener is selected from the group consisting of [rubber and ionic copolymer] at least one polymer consisting essentially of polymerized ethylene, at least one polymerized α-olefin of 3 to 6 carbon atoms, and at least one polymerized unsaturated monomer taken from the class consisting of branched, straight chain and cyclic compounds having from 4 to 14 carbon atoms and at least one additional nonconjugated unsaturated carbon-carbon bond, and grafted thereto an unsaturated monomer taken from the class consisting of α,β-ethylenically unsaturated dicarboxylic acids having from 3 to 8 carbon atoms, and derivatives thereof taken from the class consisting of monoesters of alcohols of 1 to 29 carbon atoms, anhydrides of the dicarboxylic acids, the metal salts of the dicarboxylic acids and the monoesters of said dicarboxylic acid having from 0 to 100 percent of the carboxylic groups ionized by neutralization with metal ions;
- and at least one random copolymer consisting essentially of polymerized ethylene, alkyl acrylate selected from methyl and ethyl acrylate, and from about 0.0025-0.077 mole/100 g polymer of a mono alkyl ester of 1,4-butenedioic acid in which the alkyl group of the ester has 1 to 6 carbon atoms, said copolymer having from about 0.64-0.80 mole of (—CO2—) units per 100 grams of copolymer, and having 0 to 100 percent of the esters of 1,4-butenedioic acid ionized by neutralization with metal ions selected from lithium, sodium, potassium, calcium and zinc ions, said copolymer having a melt index at 190° C. and a total load of 2160 grams of about 0.3 to 100 grams/10 minutes, and when neutralized having a melt flow rate of 0.04 to 100 grams/10 minutes under condition G of ASTM D 1238;
- and
- (c) 0.35 to 10 percent by weight organic acid, with weight percentages based on the total weight of the composition.
A process for the preparation of toughened polyamide compositions exhibiting high flow and toughness, comprising melt-mixing 40-94 percent by weight polyamide, 6-60 percent by weight toughener selected from the group consisting of rubber and ionic copolymer, and 0.35 to 10 percent by weight organic acid, with weight percentages based on the total weight of the composition.
A process for the preparation of toughened polyamide compositions exhibiting high flow and toughness, comprising melt-mixing 40-94 percent by weight polyamide, 6-60 percent by weight toughener selected from the group consisting of rubber and ionic copolymer, and 0.35 to 10 percent by weight organic acid.
Dependencies are inferred from the claim text.