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US4177201A Expired / Lapsed US ⏱️ 0.0 years remaining

Preparation of silicon-functional polyorganosiloxanes

Assignee: Momentive Performance Materials GmbH
•
Filing: 1978-12-29
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Granted: 1979-12-04
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Expires: 1998-12-29
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Abstract

Abstract A process for the preparation of an equilibrated acyloxy-containing organopolysiloxane comprising reacting at a temperature of up to 135° C. a chlorosilane of the formula R.sub.a R'.sub.b SiCl.sub.(4-a-b) wherein a=0, 1, 2 or 3 b=0, 1, 2 or 3, and a+b is at most 3, or a partial hydrolysis product thereof, with at least one organosiloxane containing the units [R.sub.2 R"--SiO.sub.178 ] [RR"--SiO] [R"--SiO.sub.3/2 ] [SiO.sub.2 ] wherein R and R' each independently is hydrogen or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, and R" is hydrogen, chlorine, hydroxyl, or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, in the presence of a proton acid siloxane-equilibration catalyst, and at least about 1.1 times the molar amount of a monobasic carboxylic acid based on the silicon-bonded chlorine atom, the number of all the Si--Cl groups in the reactants exceeding the number of all the Si--OH groups.

Inventors

  • 👤 Armand DE Montigny
  • 👤 Hans-Heinrich Moretto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 14:21
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/10; C08G77/14

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 170 words
A process for the preparation of an equilibrated acyloxy-containing organopolysiloxane comprising reacting at a temperature of up to about 135° C. a chlorosilane of the formula R.sub.a R'.sub.b SiCl.sub.(4-a-b) wherein a=0, 1, 2 or 3 b=0, 1, 2 or 3, and a+b is at most 3, or a partial hydrolysis product thereof, with one or more organosiloxanes, which can contain in appropriately alternating arrangement the units [R.sub.2 R"--SiO.sub.1/2 ] [RR"--SiO] [R"--SiO.sub.3/2 ] [SiO.sub.2 ] wherein R and R' each independently is hydrogen or an aliphatic, aromatic saturated or unsaturated optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, and R" is hydrogen, chlorine, hydroxyl, or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, in the presence of a proton acid siloxane-equilibration catalyst, and at least about 1.1 times the molar amount of a monobasic carboxylic acid based on the silicon-bonded chlorine atom, the number of all the Si--Cl groups in the reactants exceeding the number of all the Si--OH groups.
Claim 2
Dependent Claim 170 words
A process for the preparation of an equilibrated acyloxy-containing organopolysiloxane comprising reacting at a temperature of up to about 135° C. a chlorosilane of the formula R.sub.a R'.sub.b SiCl.sub.(4-a-b) wherein a=0, 1, 2 or 3 b=0, 1, 2 or 3, and a+b is at most 3, or a partial hydrolysis product thereof, with one or more organosiloxanes, which can contain in appropriately alternating arrangement the units [R.sub.2 R"--SiO.sub.1/2 ] [RR"--SiO] [R"--SiO.sub.3/2 ] [SiO.sub.2 ] wherein R and R' each independently is hydrogen or an aliphatic, aromatic saturated or unsaturated optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, and R" is hydrogen, chlorine, hydroxyl, or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, in the presence of a proton acid siloxane-equilibration catalyst, and at least about 1.1 times the molar amount of a monobasic carboxylic acid based on the silicon-bonded chlorine atom, the number of all the Si--Cl groups in the reactants exceeding the number of all the Si--OH groups.
Claim 3
Dependent Claim 25 words
A process according to claim 1, wherein the catalyst is a perfluoroalkanesulphonic acid present in about 0.05 to 1.5% by weight of the silicon-containing reactants.
Claim 4
Dependent Claim 13 words
A process according to claim 1, wherein the carboxylic acid is acetic acid.
Claim 5
Dependent Claim 24 words
A process according to claim 3, wherein the catalyst is perfluorobutanesulphonic acid present in about 0.2 to 0.4% by weight of the silicon-containing reactants.

References Cited (Backward Citations)

US3109013A Cited
US3356758A Cited
US3595885A Cited
US3819674A Cited
US4078801A Cited
US4113760A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-12-03 1983-06-04 1983-12-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-12-03 1987-06-04 1987-12-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-12-03 1991-06-04 1991-12-04 $7700.00 Window Closed / Lapsed

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