# US 10,501,612 B2 · Curable composition for sound barrier film

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- Number: US 10,501,612 B2
- Document ID: US10501612B2
- Status: Granted
- Kind: B2
- Application number: 15/571,086
- Filed: 2016-05-03
- Published: 2018-12-06
- Granted: 2019-12-10
- Earliest claimed: 2015-05-05
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Pingfan Wu; Lianzhou Chen; Fredrick W. Vance; Edward E. Cole; Charles W. Hedley; Gregory L. Simon; Michael C. Martin
- Web page: https://patentgrep.com/patent/US10501612B2

## CPC

- C08L 11/00: Compositions of homopolymers or copolymers of chloroprene
- C08J 5/121: {by heating}
- C08J 5/18: Manufacture of films or sheets
- G10K 11/162: Selection of materials
- C08J 2311/00: Characterised by the use of homopolymers or copolymers of chloroprene
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

## Abstract

A curable composition is provided comprising a curable rubber comprising: a) 80.0-99.9 wt % of a chloroprene resin; b) 0.06-13 wt % of trimethyl thiourea; and c) 0.06-13 wt % of a benzothiazolesulfenamide, such as N-cyclohexyl-2-benzothiazoles-ulfenamide. The present disclosure additionally provides cured compositions comprising a rubber comprising a crosslinked chloroprene resin and a fire retardant particle system comprising: d) 5-95 wt % particulate magnesium hydroxide (Mg(OH)2); and e) 5-95 wt % particulate aluminum trihydrate (Al(OH)3). In some embodiments the particulate aluminum trihydrate (Al(OH)3) has a mean particle size of greater than 30 microns and less than 400 microns, and more typically a mean particle size of greater than 82 microns. The present disclosure additionally provides sound barrier films comprising the cured compositions according to the present disclosure, in particular fire resistant sound barrier films.

## Claims

### Claim 1

A curable composition comprising a curable rubber comprising:
a) 80.0-99.9 wt % of a chloroprene resin;
b) 0.06-13 wt % of trimethyl thiourea; and
c) 0.06-13 wt % of a benzothiazolesulfenamide, based on the overall weight of the curable rubber, the curable composition additionally comprising a fire retardant particle system comprising:
d) 5-95 wt % particulate magnesium hydroxide (Mg(OH)2); and
e) 5-95 wt % particulate aluminum trihydrate (Al(OH)3), based on the overall weight of the fire retardant particle system, wherein the particulate aluminum trihydrate (Al(OH)3) has a mean particle size of greater than 30 microns.

### Claim 2 (depends on 1)

The curable composition according to claim 1 wherein the benzothiazolesulfenamide is N-alkyl-2-benzothiazolesulfenamide, wherein the alkyl group contains 2-10 carbon atoms and is straight, branched, or cyclic.

### Claim 3 (depends on 1)

The curable composition according to claim 1 wherein the benzothiazolesulfenamide is N-cyclohexyl-2-benzothiazolesulfenamide.

### Claim 4 (depends on 1)

The curable composition according to claim 1 wherein the particulate aluminum trihydrate (Al(OH)3) has a mean particle size of less than 400 microns.

### Claim 5 (depends on 1)

The curable composition according to claim 1 wherein the particulate aluminum trihydrate (Al(OH)3) has a mean particle size of greater than 82 microns.

### Claim 6 (depends on 1)

A film comprising the curable composition according to claim 1 having a thickness of less than 1300 microns and greater than 135 microns.

### Claim 7 (depends on 6)

A lined film comprising the film according to claim 6 borne on a liner, wherein the liner comprises high density paper having an areal density of more than 100 g/m2, a clay coating on a film-supporting face of the paper, and a silicone top coating on a reverse face of the paper.

### Claim 8 (depends on 1)

A cured composition resulting from the cure of the curable composition according to claim 1.

### Claim 9 (depends on 7)

A method of making a sound barrier film comprising the step of curing the lined film according to claim 7 while the film is borne on said liner.

### Claim 10

A cured composition comprising a rubber comprising a crosslinked chloroprene resin and a fire retardant particle system comprising:
d) 5-95 wt % particulate magnesium hydroxide (Mg(OH)2); and
e) 5-95 wt % particulate aluminum trihydrate (Al(OH)3), wherein the particulate aluminum trihydrate (Al(OH)) has a mean particle size of greater than 30 microns.

### Claim 11 (depends on 10)

The cured composition according to claim 10 wherein the particulate aluminum trihydrate (Al(OH)3) has a mean particle size of less than 400 microns.

### Claim 12 (depends on 10)

The cured composition according to claim 10 wherein the particulate aluminum trihydrate (Al(OH)3) has a mean particle size of greater than 82 microns.

### Claim 13 (depends on 9)

A sound barrier film comprising the cured composition according to claim 9 having a thickness of less than 1300 microns and greater than 135 microns.

### Claim 14 (depends on 13)

The sound barrier film according to claim 13 which is fire resistant to the extent that it passes the test specified on the filing date of this application in Appendix F, part VI, of US Federal Aviation Regulations § 25.856(a).