Thermoplastic blend

Details Thermoplastic blend Thermoplastic blend

2000-06-15

2002-04-23

Woodward, Ana (Department: 1711)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S502000, C524S503000, C524S508000, C524S513000, C524S514000, C524S517000, C524S271000, C524S519000, C525S076000, C525S150000, C525S151000, C525S153000, C525S165000, C525S177000, C525S178000, C525S184000, C525S207000, C525S213000

Reexamination Certificate

active

06376598

ABSTRACT:

FIELD
The invention relates to thermoplastic blends having improved properties. Optionally, these blends may be dynamically vulcanized.
BACKGROUND
Significant research has been conducted in an effort to find polymer blends which have a combination of both elastic and thermoplastic properties. These polymer blends have been given the generic designation of Thermoplastic Olefins (“TPO”). They exhibit some of the properties of a cured elastomer as well as the reprocessability of thermoplastic resins. The elastomeric characteristics may be enhanced if one component of the blend is a vulcanizable elastomer which is wholly or partially cross-linked.
The earliest work in the curing of TPO compositions was by Gessler and Haslett; see U.S. Pat. No. 3,037,954. That patent teaches the concept of “dynamic curing” wherein a vulcanizable elastomer is dispersed into a resinous thermoplastic polymer and the elastomer cured while continuously mixing and shearing the polymer blend. The result is a micro-gel dispersion of cured rubber in an uncured matrix of resinous thermoplastic polymer. Gessler's U.S. Pat. No. 3,037,954 discloses compositions comprising polypropylene and a rubber wherein the rubber may be butyl rubber, chlorinated butyl rubber, polybutadiene, polychloroprene and polyisobutene. Compositions of about 50 to 95 parts polypropylene and about 5 to 50 parts of rubber are disclosed.
Dynamically vulcanized thermoplastic compositions comprising a polyamide and various types of elastomers are known. See, for example, U.S. Pat. Nos. 4,173,556; 4,197,379; 4,207,404; 4,297,453; 4,338,413; 4,348,502; and 4,419,499.
It has now been found that compositions comprising a thermoplastic resin and chloromethylated(styrene-isobutylene)copolymer have improved properties which make them particularly useful in the manufacture of tires. The compositions may also comprise uncured or dynamically cured elastomers.
SUMMARY
This invention is directed generally to a composition comprising a blend of chloromethylated(styrene-isobutylene)copolymer and a thermoplastic resin selected from the group consisting of polyamides, polyesters, polycarbonates, polysulfones, polyacetals, polyacetones, acrylonitrile-butadiene styrene resins, polyphenylene oxide, polyphenylene sulfide, styrene-acrylonitrile resins, styrene-maleic anhydride resins, polyamides, aromatic polyketones, ethylene vinyl alcohol copolymer and mixtures thereof Tires and tire components such as air permeation prevention films comprising these compositions are also provided.


REFERENCES:
patent: 3067182 (1962-12-01), Jones
patent: 3948868 (1976-04-01), Powers
patent: 4074035 (1978-02-01), Powers et al.
patent: 5629386 (1997-05-01), Osman
patent: 6028147 (2000-02-01), Ogawa et al.
patent: 0 542 875 (1993-05-01), None
patent: 0 969 039 (2000-01-01), None

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