Lightly crosslinked poly(n-alkylmethylsiloxanes) and methods of

Details Lightly crosslinked poly(n-alkylmethylsiloxanes) and methods of Lightly crosslinked poly(n-alkylmethylsiloxanes) and methods of

1995-07-21

1996-02-20

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556451, 556456, 528 15, C07F 708

Patent

active

054930413

ABSTRACT:
The crosslinking and simultaneous alkylation of poly(hydridomethylsiloxanes) form crosslinked siloxanes having n-alkylmethyl groups. Without changing the chain length of the poly(hydridomethylsiloxane) starting material, a family of lightly crosslinked siloxanes having n-alkylmethyl groups, with a range of viscosities, can be produced using one or more alpha-olefins along with a small amount of an unconjugated alpha, omega-diene added as a crosslinker. The poly(hydridomethyl siloxanes) are made from highly pure silanol-free hexamethyldisiloxane and highly pure mixtures of silanol-free tetramethylcyclotetrasiloxane (D.sup.H 4) and pentamethylcyclopentasiloxane D.sup.H 5 containing no more than about 100 parts per million (ppm) water, with anhydrous trifluoromethane sulfonic acid (triflic acid, CF.sub.3 SO.sub.3 H), at room temperature, to provide linear poly(hydridomethylsiloxanes) having degrees of polymerization of up to about 250.

REFERENCES:
patent: 2491843 (1949-12-01), Wilcock
patent: 3418353 (1968-12-01), Brown
patent: 3450736 (1969-06-01), DeMonterey
patent: 3631087 (1971-12-01), Lewis et al.
patent: 3631220 (1971-12-01), Wojdac
patent: 4172101 (1979-10-01), Getson
European Polymer Journal vol. 29 N. 1. pp. 15-22 (1993).

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