Vulcanizable composition having acoustic attenuating properties

• US 8,436,105 B2
• Filed: 11/29/2011
• Issued: 05/07/2013
• Est. Priority Date: 06/08/2009
• Status: Active Grant

• Current Assignee: Henkel AG & Co KGaA
• Original Assignee: Henkel AG & Co KGaA
• Inventors: Kohlstrung, Rainer, Yamada, Takehito
• Primary Examiner(s): Rabago, Roberto
• Application Number:
  US13/306,333
• Publication Number:
  US 20120136129A1
• Time in Patent Office: 525 Days
• Field of Search: 252/182.13, 252/182.17, 252/182.23, 521/73, 521/75, 521/139, 521/140, 521/148, 525/332.5, 525/332.6, 525/332.9, 525/343, 525/346, 525/347, 525/348, 525/349, 525/387, 525/383, 524/571, 524/575, 524/576, 524/577, 524/578, 524/580
• US Class Current: 525/332.6
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08K 5/32 Compounds containing nitrogen bound to oxygen
• CPC Class Codes: C08K 5/33 Oximes
• CPC Class Codes: C08L 13/00 Compositions of rubbers containing carboxyl groups
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: C08L 9/06 Copolymers with styrene

Abstract

The invention relates to a composition that can be thermally cured, containing relative to the total composition, a) 5 to 90% by weight of a diene-based polymer or copolymer containing an olefinic double bond and/or an aromatically substituted olefin, wherein the polymer or copolymer is liquid, or paste-like, at 22° C. and has a glass transition temperature between −30° C. and +15° C., measured according to a DSC method; b) a vulcanization system selected from the group consisting of: b1) sulfur, and one or more accelerator(s), b2) peroxidic or disulfidic vulcanization systems, b3) quinones, quinone dioximes, or dinitrosobenzene.

Claims

1. A thermally curable composition, comprising, based on the total composition

a) 5 to 90 wt % of an olefinic double bond-containing copolymer based on diene and on an aromatic substituted olefin, wherein the copolymer is liquid or pasty at 22°

C. and has a glass transition temperature, measured by a DSC method, between −

30°

C. and +15°

C., and wherein the copolymer comprises a diene fraction and the diene fraction has a vinyl fraction of at least 20 mol %,

b) a vulcanization system selected from the group consisting of;

b1) sulfur and one or more accelerator(s),

b2) peroxidic or disulfidic vulcanization systems

b3) quinones, quinone dioximes or dinitrosobenzene, and

c) a blowing agent.

2. The composition according to claim 1, wherein a copolymer of styrene and a diene represents the copolymer a).

4. The composition according to claim 1, wherein the copolymer a) has a styrene content, based on the total copolymer, of at least 10 wt %.

5. The composition according to claim 1, wherein the copolymer a) has a number average molecular mass of at least 1000 and at most 50 000.

6. The composition according to claim 1, wherein the vinyl fraction in the diene fraction is at least 40 mol % and at most 80 mol %.

7. The composition according to claim 1, comprising, based on the total composition,

0.5 to 6.5 wt % sulfur,

0.25 to 20 wt % vulcanization accelerator

as the vulcanization system b).

8. The composition according to claim 1, additionally comprising, based on the total composition,

d) 10 to 45 wt. % filler.

9. The composition according to claim 1, comprising, based on the total composition, up to 6 wt % blowing agent.

10. The composition according to claim 1, additionally comprising, based on the total composition 1-12 wt % solid rubber and/or thermoplastic polymer and 1-25 wt % polydiene with a number average molecular mass in the range of 1000 to 10,000, which possesses carboxylic groups.

11. The composition according to claim 1, additionally comprising, based on the total composition, 2-40 wt % hydrocarbon resin.

12. The composition according to claim 1, additionally comprising, based on the total composition, 2-40 wt % plasticizer.

13. The composition according to claim 1, wherein at a temperature in the range of 15 to 60°

C. the composition exhibits a viscosity such that the composition can be pumped with a pump.

14. The composition according to claim 1, wherein after curing, the loss factor tan δ

measured by a DMA method is at least 0.50 in the temperature range of −

5°

C. to +40°

C.

15. The composition according to claim 1, wherein the blowing agent is a chemical blowing agent which is capable of releasing gases by decomposition when heated to an activation temperature.

16. The composition according to claim 1, wherein the blowing agent is present in an amount effective to achieve an expansion degree of 100 to 300% upon heating to an activation temperature.

17. The composition according to claim 1, wherein the copolymer is a block copolymer.

3. A thermally curable composition that is a pumpable composition at a temperature in the range of 15 to 60°

C. comprising, based on the total composition

a) 5 to 90 wt % of an olefinic double bond-containing copolymer based on diene and on an aromatic substituted olefin that is liquid or pasty at 22°

C. and that comprises a diene fraction, the diene fraction having a vinyl fraction of at least 20 mol %,

b) a vulcanization system selected from the group consisting of;

b1) sulfur and one or more accelerator(s),

b2) peroxidic vulcanization systems

b3) quinones, quinone dioximes or dinitrosobenzene, and

c) a blowing agent,

wherein after the thermal curing, the composition has a loss factor tan δ

, measured by a DMA method, of at least 0.50 in the temperature range of −

5°

C. to +40°

C.

18. A thermally curable composition, comprising, based on the total composition:

a) 5 to 90 wt % of an olefinic double bond-containing copolymer based on diene and on an aromatic substituted olefin, wherein the copolymer is liquid or pasty at 22°

C. and has a glass transition temperature, measured by a DSC method, between −

30°

C. and +15°

C., and wherein the copolymer comprises a diene fraction and the diene fraction has a vinyl fraction of at least 20 mol %,

b) a vulcanization system selected from the group consisting of;

b1) sulfur and one or more accelerator(s),

b2) peroxidic or disulfidic vulcanization systems

b3) quinones, quinone dioximes or dinitrosobenzene, and

c) up to 12 wt % solid rubber and/or thermoplastic polymer.

19. The composition according to claim 18, comprising up to 5 wt % solid rubber and/or thermoplastic polymer.

20. The composition according to claim 18, wherein the vinyl fraction in the diene fraction is at least 40 mol % and at most 80 mol %.