C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 265/04 (2006.01) C08L 51/00 (2006.01) C08L 51/04 (2006.01)
Patent
CA 2045454
BFG-880109 Title: THERMOPLASTIC ELASTOMERS COMPRISING VINYL HALIDE GRAFTED TO CROSSLINKED ACRYLIC LATEXES Abstract of the Disclosure Thermoplastic elastomer resins are described which comprise vinyl halide grafted to crosslinked acrylic latex particles comprising predominantly acryl- ate-containing, crosslinked polymer chains derived from (A) at least one acrylate monomer of the formula CH2=C(R1)C(O)OR2 (I) wherein R1 is hydrogen or methyl; and R2 is an alkyl group containing from 1 to 20 carbon atoms, an alkoxy alkyl or alkyl thioalkyl group containing from 2 to about 7 carbon atoms, or a cyano alkyl group containing from 2 to about 7 carbon atoms; and (B) at least one alpha, beta-unsaturated dicarboxylic acid, provided that the dicarboxylic acid repeating units are optional when the TPE resin contains less than about 35% by weight of vinyl halide. An improved process is described for preparing the crosslinked acrylic latexes utilized in the prepar- ation of TPEs, and a process is described for preparing TPEs of the invention which comprises (A) preparing a crosslinked acrylic latex by polymerizing in water a mixture comprising at least one acrylate monomer of Formula I, and at least one multi- functional crosslinking monomer, an initiator, and from 0 to about 20 phm of at least one alpha, beta-unsatur- ated dicarboxylic acid while delaying the polymerization of at least a portion of the crosslinking monomer until at least a portion of the acrylic monomer has polymer- ized; (B) grafting a vinyl halide monomer to the crosslinked latex particles prepared in step (A) in water in the presence of a second initiator to form an aqueous mixture containing a TPE resin; (C) recovering the TPE resin from the aqueous mixture; and (D) compounding with suitable additives to produce useful thermoplastic elastomers.
Dearth Miles B.
Skillicorn Douglas E.
Stanislawczyk Vic
Wypart Roman W.
Dearth Miles B.
Skillicorn Douglas E.
Stanislawczyk Vic
Swabey Ogilvy Renault
The B.f. Goodrich Company
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