Stock material or miscellaneous articles – Composite – Of polyamide
Patent
1996-09-11
1998-12-01
Short, Patricia A.
Stock material or miscellaneous articles
Composite
Of polyamide
4284749, 4284761, 4284769, 525 66, 525 92B, 525179, 525184, C08L 2326
Patent
active
058435778
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to thermoplastic elastomers (TPE) having improved surface properties, particularly adhesion to engineering resins such as nylon. A thermoplastic elastomer is generally defined as a polymer or blend of polymers that can be processed and recycled in the same way as a conventional thermoplastic material, yet has properties and performance similar to that of vulcanized rubber at service temperatures. Blends or alloys of plastic and elastomeric rubber have become increasingly important in the production of high performance thermoplastic elastomers, particularly for the replacement of thermoset rubber in various applications.
2. Description of the Related Art
Polymer blends which have a combination of both thermoplastic and elastic properties are generally obtained by combining a thermoplastic polyolefin with an elastomeric composition in a way such that the elastomer is intimately and uniformly dispersed as a discrete particulate phase within a continuous phase of the thermoplastic. Early work with vulcanized compositions is found in U.S. Pat. No. 3,037,954 which discloses static vulcanization as well as the technique of dynamic vulcanization wherein a vulcanizable elastomer is dispersed into a resinous thermoplastic polymer and the elastomer is cured while continuously mixing and shearing the polymer blend. The resulting composition is a microgel dispersion of cured elastomer, such as butyl rubber, chlorinated butyl rubber, polybutadiene or polyisobutene in an uncured matrix of thermoplastic polymer such as polypropylene.
In U.S. Pat. No. 32,028 (reissued) polymer blends comprising an olefin thermoplastic resin and an olefin copolymer rubber are described, wherein the rubber is dynamically vulcanized to a state of partial cure. The resulting compositions are reprocessible.
U.S. Pat. Nos. 4,130,534 and 4,130,535 disclose thermoplastic elastomer compositions comprising butyl rubber and polyolefin resin, and olefin rubber and polyolefin resin, respectively. The compositions are prepared by dynamic vulcanization and the rubber component is cured to the extent that it is essentially insoluble in conventional solvents. No details are given regarding adhesion properties.
U.S. Pat. No. 4,350,750 teaches the improvement of olefin polymers by modification of the olefin polymer, preferably a thermoplastic olefin polymer by reaction with a substituted maleamic acid of the formula or of 2-18 carbon atoms or arylene of 1-12 carbon atoms.
The olefin polymers comprise amorphous or crystalline essentially saturated homopolymers or copolymers of C.sub.2 -C.sub.8 alpha monoolefins.
U.S. Pat. No. 4,728,692 discloses a thermoplastic elastomer composition comprising (A) 10 to 90 parts by weight of crystalline polyolefin such as polypropylene, (B) 10 to 90 parts by weight of halogenated butyl rubber (with the total amount of (A) and (B) being 100 parts by weight), (C) 10 to 120 parts by weight of olefin copolymer rubber, (D) 1 to 90 parts by weight of modified polyolefin, and optionally (E) 2 to 50 parts by weight of nitrile rubber, said composition being partially crosslinked in the presence of a crosslinking agent of a metal oxide and/or a metal chloride.
The modified polyolefin (D) includes those which are formed by adding an unsaturated carboxylic acid or a derivative thereof to a polyolefin, e.g. homopolymers of alpha-olefins such as ethylene, propylene, 1-butene, 1-hexene, and 4-methyl-1-pentene, and copolymers of ethylene with one or more alpha-olefins.
Examples of the unsaturated carboxylic acid include maleic acid, fumaric acid, acrylic acid, and methacrylic acid or their anhydride-, amide-, or ester derivative.
Component (D) in said composition functions as a binder which makes the individual components in the composition compatible/miscible with one another.
U.S. Pat. No. 4,957,968 discloses an adhesive thermoplastic elastomer composition comprising three major components as follows: group such as a carboxylic acid or its derivatives including a
REFERENCES:
patent: 5003003 (1991-03-01), Olivier
patent: 5155159 (1992-10-01), Ohmae
patent: 5270377 (1993-12-01), Otawa
patent: 5312867 (1994-05-01), Mitsuno
patent: 5574105 (1996-11-01), Vonkataswamy
Horrion Jacques
Ouhadi Trazollah
Advanced Elastomer Systems L.P.
Short Patricia A.
Skinner William A.
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