Strain-crystallizing poly(methyl(3,3,3-trifluoropropyl)-siloxane

Details Strain-crystallizing poly(methyl(3,3,3-trifluoropropyl)-siloxane Strain-crystallizing poly(methyl(3,3,3-trifluoropropyl)-siloxane

1994-02-03

1996-02-20

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 17, 528 18, 528 14, 528 37, 528 42, C08G 7708

Patent

active

054929938

ABSTRACT:
Strain-crystallizing poly{methyl(3,3,3-trifluoropropyl)siloxane} elastomers and methods for their making. The process comprises the cross-linking of cis stereoregular polymers prepared by reacting isomers of 1,3,5-trimethyl-1,3,5-tris(3',3',3'-trifluoropropyl)cyclotrisiloxane, where at least 30 percent of the isomers are of cis configuration, in the presence of an aprotic polar promoter and a lithium compound. The lithium compound initiates ring opening and polymerization of the isomers without affecting the steric arrangement of the leomars. Elastomers prepared by cross-linking these cis stereoregular polymers have sufficient cis 3,3,3-trifluoropropyl substitution to allow the elastomers to strain crystallize and provide reinforcement to the elastomers at typical use temperatures.

REFERENCES:
patent: 3337497 (1967-08-01), Bostick
patent: 3575921 (1971-04-01), Lee
patent: 5401822 (1995-03-01), Collins et al.
Curtis et al., Polym. Preprin., Div. Polym. Chem., Am. Chem. Soc., 25 (1984) 1.
Momper et al., Polym. Commun. 31 (1990) 186.
Rubber Chemistry and Technology, Rubber Reviews for 1979, vol. 52 (No. 3) pp. 447-454.

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