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EP0950685A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Heat-curable silicone rubber compositions having resistance to engine oils and coolants

Assignee: Dow Silicones Corp
•
Filing: 1999-04-13
•
Granted: —
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Expires: 2019-04-13
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Abstract

Abstract A heat-curable silicone rubber composition is disclosed having improved resistance to engine oils and coolants, including extended-life coolants and synthetic motor oils. Said composition comprises: (A) 100 parts by weight of an organosiloxane polymer base comprising a mixture of an organosiloxane polymer, containing at least 2 silicon-bonded alkenyl groups in each molecule and 1 to 65 weight percent of a reinforcing silica filler, (B) a curing component in an amount sufficient to cure the composition when heated, and (C) an effective amount of at least one metal salt additive selected from monobasic alkali metal phosphates, alkali metal oxalates, alkali metal tartrates, alkali metal tetraborates, alkali metal phthalates and alkali metal citrates; dibasic metal phosphates where the metal is sodium, potassium, calcium or magnesium; metal acetates, where the metal is sodium, potassium, calcium or magnesium; metal sulfates where the metal is sodium, potassium, calcium, magnesium, aluminum or zinc; and metal carbonates where the metal is sodium, potassium, calcium, magnesium, aluminum or zinc.

Inventors

  • 👤 Jon Vierling Degroot Jr.
  • 👤 Lawrence Dale Fiedler
  • 👤 William James Schultz Jr.
  • 👤 Antony Pope Wright

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 12:31
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; C08K3/18; C08K3/24; C08K3/26; C08K3/30; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/20

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 146 words
A heat-curable silicone rubber composition comprising: (A) 100 parts by weight of an organosiloxane polymer base comprising an organosiloxane polymer containing at least 2 silicon-bonded alkenyl groups in each molecule and 1 to 65 weight percent of a reinforcing silica filler, (B) an amount of a curing component sufficient to cure the composition when heated, and (C) an effective amount of at least one metal salt additive selected alkali metal citrates, alkali metal oxalates, monobasic alkali metal phosphates, alkali metal phthalates, alkali metal tartrates and alkali metal tetraborates; dibasic metal phosphates where the metal is selected from sodium, potassium, calcium and magnesium; metal acetates, where the metal is selected from sodium, potassium, calcium and magnesium; metal sulfates where the metal is selected from sodium, potassium, calcium, magnesium, aluminum and zinc; and metal carbonates where the metal is selected from sodium, potassium, calcium, magnesium, aluminum and zinc.
Claim 2
Dependent Claim 38 words
The composition according to claim 1, wherein said organosiloxane polymer has the average formula of R a siO (4-a)/2 and R is a substituted or unsubstituted monovalent hydrocarbon group and "a" is a value from 1.95 to 2.05.
Claim 3
Dependent Claim 34 words
The composition according to claim 1 or 2, wherein said organosiloxane polymer base further comprises 1 to 100 parts by weight of an extending filler, per 100 parts by weight of the polyorganosiloxane polymer.
Claim 4
Dependent Claim 17 words
The composition according to any of claims 1 to 3, wherein Component (B) comprises an organohydrogensiloxane crosslinker.
Claim 5
Dependent Claim 18 words
The composition according to any of claims 1 to 4, wherein component (B) comprises a platinum-group, metal-containing catalyst.
Claim 6
Dependent Claim 31 words
The composition according to any of claims 1 to 5, wherein component (C) comprises 0.5 to 20 weight parts of metal salt additive per 100 weight parts of organosiloxane polymer base.

References Cited (Backward Citations)

US4689363A Cited
EP0752450A1 Cited

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