# US 2010/0166970 A1 · Release Coating Composition and Method of Forming the Same

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- Number: US 2010/0166970 A1
- Document ID: US20100166970A1
- Status: Published application
- Kind: A1
- Application number: 12/601,875
- Filed: 2008-05-23
- Published: 2010-07-01
- Earliest claimed: 2007-05-25
- Assignees: Dow Corning Corporation
- Inventors: Robert Ekeland
- Web page: https://patentgrep.com/patent/US20100166970A1

## CPC

- C09D 183/04: Polysiloxanes
- A61K 9/2853: {obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, polyethylene oxide, poloxamers, poly(lactide-co-glycolide)}
- A61P 13/00: Drugs for disorders of the urinary system
- Y10T 428/31663: As siloxane, silicone or silane
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61P: SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A release coating composition includes a curable polysiloxane and an aerosol suppressant that has more than one SiO4/2 unit. The aerosol suppressant includes the polymerization product of a siloxane and a cyclic polysiloxane polymerized in the presence of a polymerization catalyst. The siloxane has units of the chemical formula (SiO4/2)(RaRb2SiO1/2)x wherein Ra is a vinyl moiety, Rb is an alkyl moiety, and x is a number from 1.05 to 4. The release coating composition is formed by combining the aerosol suppressant and a curable polysiloxane. The release coating composition is also used to coat a substrate in a release coating process producing a mist of less than 50 mg/cubic meter measured at approximately 457 m/min.

## Claims

### Claim 1

A release coating composition comprising:
A. an aerosol suppressant having more than one SiO4/2 unit and comprising a polymerization product of;
(1) a siloxane containing units of the chemical formula (SiO4/2)(RaRb2SiO1/2)x
wherein Ra is selected from the group of an alkyl moiety having from 1 to 6 carbon atoms, an alkenyl moiety having from 2 to 6 carbon atoms, and an alkynyl moiety having from 2 to 6 carbon atoms, Rb is selected from the group of an alkyl moiety having from 2 to 6 carbon atoms, an aryl moiety, an alkoxy moiety, an acrylate moiety, and a methacrylate moiety, and x is a number from 1.05 to less than 4, and
(2) a cyclic polysiloxane,
wherein said siloxane and said cyclic polysiloxane are polymerized in the presence of a polymerization catalyst; and
B. a curable polysiloxane.

### Claim 2 (depends on 1)

A composition as set forth in claim 1 wherein said polymerization catalyst is selected from the group of strong acid catalysts, strong base catalysts, and combinations thereof.

### Claim 3 (depends on 2)

A composition as set forth in claim 2 wherein said strong acid catalyst is further defined as trifluoromethane sulfonic acid.

### Claim 4 (depends on 2)

A composition as set forth in claim 2 wherein said strong base catalyst is further defined as a phosphazene base catalyst.

### Claim 5 (depends on 1)

A composition as set forth in claim 1 wherein said aerosol suppressant has from 1.05 to less than 4 SiO4/2 units

### Claim 6 (depends on 5)

A composition as set forth in claim 5 wherein said aerosol suppressant has from 2 to less than 4 SiO4/2 units.

### Claim 7 (depends on 1)

A composition as set forth in claim 1 wherein said aerosol suppressant further contains at least one Rb2SiO2/2 unit bonded to each of said more than one SiO4/2 units.

### Claim 8 (depends on 7)

A composition as set forth in claim 7 wherein said aerosol suppressant has four blocks of (CH3)2SiO2/2 units bonded to each of said more than one SiO4/2 units.

### Claim 9 (depends on 7)

A composition as set forth in claim 7 wherein said aerosol suppressant has from 1,000 to 5,000 (CH3)2SiO2/2 units.

### Claim 10 (depends on 1)

A composition as set forth in claim 1 wherein said aerosol suppressant has eight RaRb2SiO1/2 units.

### Claim 11 (depends on 1)

A composition as set forth in claim 1 wherein said aerosol suppressant has a degree of polymerization from 1,000 to 4,000.

### Claim 12 (depends on 1)

A composition as set forth in claim 1 wherein said aerosol suppressant is present in an amount from 1 to 5 parts by weight per 100 parts by weight of said composition.

### Claim 13 (depends on 1)

A composition as set forth in claim 1 wherein said siloxane is polymerized with said cyclic polysiloxane in a weight ratio from 0.2:99.8 to 4:96.

### Claim 14 (depends on 1)

A composition as set forth in claim 1 producing a mist of less than 50 mg/cubic meter when applied to a substrate at about 457 meters per minute.

### Claim 15 (depends on 1)

A composition as set forth in claim 1 wherein said aerosol suppressant has four SiO4/2 units, from 360 to 1,600 (CH3)2SiO2/2 units bonded to each of said four SiO4/2 units, eight (CH3)2(CH2CH)SiO1/2 units terminally bonded to four of said (CH3)2SiO2/2 units, and is present in an amount from 1 to 5 parts by weight per 100 parts by weight of said composition, and wherein Ra is a vinyl moiety, Rb is a methyl moiety, said siloxane is polymerized with said cyclic polysiloxane in a weight ratio from 0.2:99.8 to 4:96, said cyclic polysiloxane is selected from the group of decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, and combinations thereof, said polymerization catalyst is a phosphazene base catalyst of the chemical formula:
((Rc2N)3P═N)t(Rc2N)3-tP═NRd
wherein each of Rc and Rd are independently selected from the group of a hydrogen atom, a hydrocarbon, and combinations thereof and t is a number from 1 to 3, and said composition produces a mist of less than 50 mg/cubic meter when applied to a substrate at about 457 meters per minute.

### Claim 16

A method of forming a release coating composition, said method comprising the steps of:
A. polymerizing a siloxane having units of the chemical formula (SiO4/2)(RaRb2SiO1/2)x wherein Ra is selected from the group of an alkyl moiety having from 1 to 6 carbon atoms, an alkenyl moiety having from 2 to 6 carbon atoms, and an alkynyl moiety having from 2 to 6 carbon atoms, Rb is selected from the group of an alkyl moiety having from 1 to 6 carbon atoms, an aryl moiety, an alkoxy moiety, an acrylate moiety, and a methacrylate moiety, and x is a number from 1.05 to less than 4, with a cyclic polysiloxane in the presence of a polymerization catalyst to form an aerosol suppressant having more than one SiO4/2 unit; and
B. combining the aerosol suppressant and a curable polysiloxane to form the release coating composition.

### Claim 17 (depends on 16)

A method as set forth in claim 16 wherein the polymerization catalyst is selected from the group of strong acid catalysts, strong base catalysts, and combinations thereof.

### Claim 18 (depends on 16)

A method as set forth in claim 16 wherein the polymerization catalyst is further defined as a phosphazene base catalyst.

### Claim 19 (depends on 16)

A method as set forth in claim 16 wherein the aerosol suppressant has from 1.05 to less than 4 SiO4/2 units

### Claim 20 (depends on 16)

A method as set forth in claim 16 wherein the composition produces a mist of less than 50 mg/cubic meter when applied to a substrate at about 457 meters per minute.

### Claim 21

A method of coating a substrate in a release coating process, said method comprising the steps of:
A. polymerizing a siloxane having units of the chemical formula (SiO4/2)(RaRb2SiO1/2)x wherein Ra is selected from the group of an alkyl moiety having from 1 to 6 carbon atoms, an alkenyl moiety having from 2 to 6 carbon atoms, and an alkynyl moiety having from 2 to 6 carbon atoms, Rb is selected from the group of an alkyl moiety having from 1 to 6 carbon atoms, an aryl moiety, an alkoxy moiety, an acrylate moiety, and a methacrylate moiety, and x is a number from 1.05 to less than 4, with a cyclic polysiloxane in the presence of a polymerization catalyst to form an aerosol suppressant having more than one SiO4/2 unit; and
B. combining the aerosol suppressant and a curable polysiloxane to form a release coating composition; and
C. applying the release coating composition to the substrate in the release coating process.

### Claim 22 (depends on 21)

A method as set forth in claim 21 wherein the polymerization catalyst is selected from the group of strong acid catalysts, strong base catalysts, and combinations thereof.

### Claim 23 (depends on 21)

A method as set forth in claim 21 wherein the polymerization catalyst is further defined as a phosphazene base catalyst.

### Claim 24 (depends on 21)

A method as set forth in claim 21 wherein the aerosol suppressant has from 1.05 to less than 4 SiO4/2 units

### Claim 25 (depends on 21)

A method as set forth in claim 21 producing a mist of less than 50 mg/cubic meter when the composition is applied to the substrate at about 457 meters per minute.

### Claim 26 (depends on 1)

A composition as set forth in claim 1 wherein said aerosol suppressant has a viscosity of from 30,000 to 120,000 MPa·s at 25° C.