US3862065A
Expired / Lapsed
US
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Granular silicone molding compositions
Assignee: Individual
•
Filing: 1973-08-09
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Granted: 1975-01-21
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Expires: 1993-08-09
Abstract
Abstract Granular silicone molding compositions consisting essentially of an organosiloxane resin whose melting point as measured by Durran''s mercury method is 25* to 200*C, having per silicon atom an average of from 1.0 to 1.7 organic radicals directly bonded to the silicon atoms and containing at least 0.25% by weight, based on the organosiloxane resin, of hydroxyl radicals directly bonded to the silicon atoms; glass fibres having lengths ranging from 0.2 to 10 mm; powdery inorganic fillers; and a catalytic amount of a curing catalyst combination. The compositions impart excellent mechanical strength to molded articles made therefrom and are easily handled.
Inventors
- 👤 Kiyoshi Yokokawa
- 👤 Jun Koizumi
- 👤 Shigeo Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:55
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
The granular silicone molding composition as claimed in claim 1 wherein said organosiloxane resin contains units selected from tHe group consisting of CH3Si01.5, C6H5Si01.5, CH2 CHSi01.5, CH2 CHCH2Si01.5, C3H7Si01.5, C5H11Si01.5, C6H11Si01.5, Cl2C6H3Si01.5, CF3CH2CH2CH2Si01.5, (CH3)2Si0, (C2H5)2Si0, (C6H5)2Si0, CH3(CH2 CH)Si0, CH3(C6H5)Si0, C6H5(CH2 CH)Si0,C6H5(C2H5)Si0, CF3CH2CH2CH2(CH3)Si0 and Si02, with the provision that the average per silicon atom of organic radicals directly bonded to the silicon atoms is from 1.0 to 1.7.
Claim 2
Dependent Claim
28 words
The granular silicone molding composition as claimed in claim 1 wherein said organosiloxane resin has a melting point of from 50*to 120*C as measured by Durran''s mercury method.
Claim 3
Dependent Claim
22 words
The granular silicone molding composition as claimed in claim 1 wherein said glass fibres have lengths ranging from 0.2 to 6 mm.
Claim 4
Dependent Claim
42 words
The granular silicone molding composition as claimed in claim 1 wherein said powdery inorganic filler is at least one member selected from the group consisting of diatomaceous earth, clay, crushed quartz, fume silica, precipitated silica, zirconium silicate, magnesium silicate and aluminium silicate.
Claim 5
Dependent Claim
37 words
The granular silicone molding composition as claimed in claim 5 wherein said powdery inorganic filler is used together with at least one selected from the group consisting of calcium carbonate, magnesium oxide, titanium oxide and aluminium oxide.
Claim 6
Dependent Claim
27 words
The granular silicone molding composition of claim 1 wherein said organosiloxane resin contains alkoxy radicals selected from the group consisting of methoxy, ethoxy, propoxy and butoxy radicals.
Claim 7
Dependent Claim
80 words
The granular silicone molding composition of claim 1 wherein said curing catalyst consists essentially of an organic acid salt of a metal, selected from the group consisting of lead, zinc, tin, cobalt or an inorganic lead compound selected from the group consisting of lead carbonate, lead sulfide and lead oxide, and at least one member selected from the group consisting of acetic acid, propionic acid, butyric acid, lauric acid, palmitic acid, stearic acid, benzoic acid, phthalic acid, and anhydrides thereof.
Claim 8
Dependent Claim
201 words
A granular silicone molding composition which consists essentially of a. 100 parts by weight of an organosiloxane resin whose melting point as measured by Durran''s mercury method is from 50* to 120*C, having per silicon atom an average of from 1.0 to 1.7 organic radicals directly bonded to the silicon atoms and containing at least 0.25% by weight of hydroxyl radicals directly bonded to the silicon atoms, b. from 50 to 200 parts by weight of glass fibres having lengths subsequent to being mixed in the present composition of from 0.2 to 10 mm, c. from 10 to 200 parts by weight of at least one powdery inorganic filler, and d. a catalytic amount of a curing catalyst composed of a mixture of at least one member selected from the group consisting of organic salts of metals, and inorganic lead compounds, and at least one member selected from the group consisting of aliphatic acids, aromatic acids, and anhydrides thereof, or a mixture of at least one organic amine and at least one ammonium salt of an organic acid selected from the group consisting of acetic acid, propionic acid, butyric acid, lauric acid, palmitic acid, stearic acid, benzoic acid, and phthalic acid.
Claim 9
Dependent Claim
25 words
The granular silicone molding composition as claimed in claim 9 which has a particle size ranging from 4 to 36 mesh of the Tyler screen.
References Cited (Backward Citations)
US3160601A
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US3280071A
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US3208961A
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US3264260A
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US3627729A
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US3666830A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |