C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/64
C08J 9/06 (2006.01) C08J 9/00 (2006.01) C08K 5/16 (2006.01) C08L 27/04 (2006.01)
Patent
CA 1196150
ABSTRACT OF THE DISCLOSURE This invention provides a process for making a vinyl chloride polymer foam. The process comprises the steps of (l) preparing a composition consisting of (a) a vinyl chloride polymer selected from the group consisting of poly- vinyl chloride, polyvinylidene chloride, copolymers of poly- vinyl chloride, chlorinated polyethylene; (b) per 1 part of vinyl chloride polymer 2-100 parts of at least one inorganic filler; (c) a blowing agent and (d) per 1 part of polymer 0.05 parts of an organic radical initiator selected from the group consisting of azobisalkylnitrile, azobiscyclohexylcarbo- nitrile, azobisster, phenylazotriphenylmethane, phenylazothio- phenylether, phenylazophenylamine, azobisbenzoyl, tetraalkylte- trazane, 4,4'-azobis-4-cyano valeric acid, dibenzothiazoledisul- fide, metal compound of 2-mercapto benzothiazole, N-cyclohexyl- 2-benzothiazolyl sulphenamide, tetraalkylthiuramdisulfide, metal derivatives of dialkyldithiocarbamic acid, and (2) blend- ing the above composition until the temperature of the mixture is raised to about 40-60 degrees. The process renders a highly expanded and non-flammable rigid foam, which can be used for, e.g., insulating material.
415301
Kojima Hirosuke
Otsu Takayuki
Kojima Hirosuke
Mcfadden Fincham
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