High-strength silicone rubber particulate

Details High-strength silicone rubber particulate High-strength silicone rubber particulate

1991-10-25

1993-01-05

Marquis, Melvyn I.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

523216, 524847, 524837, 524861, 524863, 524860, 106490, B32B 2714, C04B 1404, C08L 8304

Patent

active

051769603

ABSTRACT:
A hydrophobic silica is prepared by mixing and heating a mixture of (a) 100 weight parts wet-method silica and (b) 1 to 100 weight parts organopolysiloxane represented by the following average unit formula R.sup.1.sub.a R.sup.2.sub.b SiO.sub.(4-a-b)/2, wherein R.sup.1 is a monovalent hydrocarbon group, R.sup.2 is the hydrogen atom, a is from 1 to 3 inclusive, and b is from zero to 1 inclusive, with the provisos that a+b is from 1.90 to 2.10 inclusive and b/(a+b) is from zero to 0.45 inclusive. This hydrophobic silica is used to prepare a high-strength silicone rubber particulate by mixing with a curable dioranopolysiloxane and curing the mixture in the form of particulates. A preferred manner of making the particulates is by emulsifying the mixture of hydrophobic silica and curable diorganopolysiloxane in water, then spraying the emulsion into a hot gas to cure the silicone rubber composition and remove the water, giving microparticles of high-strength silicone rubber.

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patent: 4454288 (1984-06-01), Lee et al.
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patent: 4609486 (1986-09-01), Freiberg et al.
patent: 4743670 (1988-05-01), Yoshida et al.
patent: 4749765 (1988-06-01), Shimizu et al.
patent: 4857564 (1989-08-01), Maxson
patent: 4950502 (1990-08-01), Saam et al.
patent: 4978710 (1990-12-01), Liles

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