Thermoplastic blend of oxymethylene copolymers exhibiting improv

Details Thermoplastic blend of oxymethylene copolymers exhibiting improv Thermoplastic blend of oxymethylene copolymers exhibiting improv

1982-05-26

1983-10-11

Briggs, Sr., Wilbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525410, 525472, C08L 5904

Patent

active

044093705

ABSTRACT:
A polymer blend comprising a first copolymer and a second copolymer and having improved impact resistance is provided. The first copolymer has recurring units which consist essentially of oxymethylene groups having the formula --OCH.sub.2 --interspersed with ##STR1## groups, where each R.sub.1 and R.sub.2 is selected from the group consisting of hydrogen, lower alkyl radicals, and halogen-substituted lower alkyl radicals, each R.sub.3 is selected from the group consisting of methylene, oxymethylene, lower alkyl and haloalkyl substituted methylene, and lower alkyl and haloalkyl substituted oxymethylene radicals, and n is an integer from zero to three, each lower alkyl radical having one to two carbon atoms. The oxymethylene units comprise approximately 85 to approximately 99.9 mole percent of the recurring units of the first copolymer. The second copolymer has recurring units which consist essentially of oxymethylene groups having the formula--OCH.sub.2 --interspersed with ##STR2## groups where R.sub.1, R.sub.2, R.sub.3, and n have the same meanings as the corresponding symbols used with regard to the first copolymer and where the selections made with regard to the second copolymer are independent of the selections made with regard to the first copolymer, the oxymethylene groups of the second copolymer comprising approximately 50 to approximately 75 mole percent of the recurring units of the second copolymer. The second copolymer comprises approximately 1.5 to approximately 40 weight percent of the blend.

REFERENCES:
patent: 3485799 (1969-12-01), Park
patent: 3519696 (1970-07-01), Cherdron et al.
patent: 3795715 (1974-03-01), Cherdron et al.
patent: 3848021 (1974-11-01), Sextro et al.

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