Process for making deodorized rubbery polymer

Details Process for making deodorized rubbery polymer Process for making deodorized rubbery polymer

1999-02-04

2000-12-26

Pezzuto, Helen L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526173, 526181, 526184, 5262192, 5263285, 5263292, 526341, 526346, C08F22012

Patent

active

061661600

ABSTRACT:
There is a need for odorless rubbery polymers that offer high heat resistance, ultraviolet light resistance and low fogging characteristics. For instance, rubbery polymers of this type are needed by the automotive and construction industries. The deodorized rubbery polymers of this invention are of particular value because they can be blended with polyvinyl chloride to make leathery compositions having good heat and ultraviolet light resistance. The present invention more specifically discloses a process for preparing a deodorized rubbery polymer which comprises the steps of (1) polymerizing in a first stage (a) butyl acrylate, (b) at least one member selected from the group consisting of methyl methacrylate, ethyl methacrylate, methyl acrylate and ethyl acrylate, (c) acrylonitrile and (d) a crosslinking agent under emulsion polymerization conditions to produce a seed polymer containing latex, wherein said polymerization is initiated with a redox initiator system, wherein the redox initiator system is comprised of a free radical generator and a reducing agent; (2) adding (a) styrene, (b) additional acrylonitrile, (c) additional crosslinking agent and (d) additional free radical generator to the seed polymer containing latex under emulsion polymerization conditions which result in the formation of an emulsion containing the rubbery polymer; and (3) recovering the rubbery polymer from the emulsion containing the rubbery polymer.

REFERENCES:
patent: 5415940 (1995-05-01), Dang Ngoc et al.
patent: 5616651 (1997-04-01), Nino et al.
patent: 5674933 (1997-10-01), Dang Ngoc et al.

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