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US3674738A Expired / Lapsed US ⏱️ 0.0 years remaining

Room temperature vulcanizable silicone rubber stocks

Assignee: Wacker Chemie AG
•
Filing: 1970-08-13
•
Granted: 1972-07-04
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Expires: 1990-08-13
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Abstract

Abstract A room-temperature vulcanizable silicone rubber stock is prepared by admixing an essentially linear diorganopolysiloxane having reactive end groups, preferably hydroxyl and groups, and as a crosslinker an organosilicon compound containing both oxime groups bonded to silicon through oxygen atoms and amino groups bonded to silicon through Si-N bonding. These materials can be stored in the absence of moisture and will cure to form elastomeric products upon exposure to moisture. Particularly useful as crosslinking agents are silanes of the general formula RaSi(ON=X)b(NR''R)c wherein R is a monovalent hydrocarbon radical, R'' is a monovalent hydrocarbon radical or H, X is RR''C= or R2C= where R2 is a divalent hydrocarbon radical, a is 0 or 1, b and c have an average value of at least 0.5, b + c is 3 or 4 and a + b + c is 4.

Inventors

  • 👤 Siegfried Nitzsche
  • 👤 Wolfgang Kaiser
  • 👤 Ernst Wohlfarth
  • 👤 Paul Hittmair

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 18:24
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/18; C08G77/22; C08G77/24; C08G77/26; Y; Y10; Y10S; Y10S528/00; Y10S528/901

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 223 words
A room-temperature vulcanizable silicone rubber stock, stable in the absence of moisture and curable in the presence of moisture to form elastomers consisting essentially of (A) an essentially linear, hydroxyl endblocked diorganopolysiloxane of the general formula (HO)x(RySiO )nH wherein R is a hydrocarbyl radical, a halogenohydrocarbyl radical or a cyanoalkyl radical, x has an average value of 0.99 to 1.01, y has an average value of 1.99 to 2.01 and n has a value such that the viscosity of the polymer is in the range from 100 to 500,000 cs. at 25* C., and (B) 0.2 to 15 percent by weight based on the total weight of (A) and (B) of a crosslinking agent of the general formula RaSi(ON=X)b(NR''R)c wherein R is a hydrocarbyl radical, a halogenohydrocarbyl radical or a cyanoalkyl radical, R'' is a hydrogen atom or an R radical, X is a radical of the formula =CRR3 or =CR2 where R3 is hydrogen or a R radical, R2 is a divalent hydrocarbon or halogenated hydrocarbon radical, a is 0 or 1, b is 1, 2 or 3, c is 1, 2 or 3, a + b is 3 or 4, a + b + c is 4, there being present in the crosslinking agent (B) an average of at least 0.5 -ON=X and at least 0.5 -NR''R groups per silicon atom.
Claim 2
Dependent Claim 11 words
The silicone rubber stock of claim 2 also containing a filler.
Claim 3
Dependent Claim 12 words
The silicone rubber stock of claim 2 also containing a condensation catalyst.
Claim 4
Dependent Claim 15 words
The silicone rubber stock of claim 2 also containing a filler and a condensation catalyst.
Claim 5
Dependent Claim 15 words
The silicone rubber stock of claim 1 also containing a filler and a condensation catalyst.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-07-04 1976-01-03 1976-07-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-07-04 1980-01-03 1980-07-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-07-04 1984-01-03 1984-07-04 $7700.00 Window Closed / Lapsed

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