Compositions Containing Styrene-Isobutylene-Styrene And Styrene-Ethylene/Butylene-Styrene Block Copolymers

• US 20110184082A1
• Filed: 01/19/2011
• Published: 07/28/2011
• Est. Priority Date: 01/27/2010
• Status: Active Grant

• Current Assignee: Kraton Polymers US LLC (DL Holdings Co., Ltd.)
• Original Assignee: Kraton Polymers US LLC (DL Holdings Co., Ltd.)
• Inventors: Wright, Kathryn J., McGilbert, Sharman K.
• Granted Patent: US 8,299,177 B2
• Time in Patent Office: Days
• US Class Current: 521/148
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 53/025 modified
• CPC Class Codes: C08L 91/00 Compositions of oils, fats or waxes; Compositions of derivatives thereof

Abstract

The present invention provides for a composition that includes a hydrogenated styrenic block copolymer that has at least one block A and at least one block B, and about 10 to about 90 percent by weight of an styrene-isobutylene-styrene block copolymer. Each A is an monoalkenyl arene and each B block is a controlled distribution copolymer of at least one mono alkenyl arene and at least one conjugated diene, having the general formula A-EB/A-A and (A-EB/A)nX. Each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono alkenyl arene units. Oil-free compositions that result in the combination of low gaseous permeability, low thermal conductivity, strong vibration and sound attenuation, and optionally high levels of light transmission with relatively low haze values while maintaining melt flow rates suitable for easy processability are preferred.

Claims

1. A block copolymer composition comprising:

(1) a hydrogenated block copolymer that has at least one block A and at least one block B, and wherein;

a. prior to hydrogenation each A block is a mono alkenyl arene homopolymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono alkenyl arene;

b. subsequent to hydrogenation about 0-10% of the arene double bonds have been reduced, and at least about 90% of the conjugated diene double bonds have been reduced;

c. each A block having a number average molecular weight between about 3,000 and about 60,000 and each B block having a number average molecular weight between about 30,000 and about 300,000;

d. each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono alkenyl arene units;

e. the total amount of mono alkenyl arene in the hydrogenated block copolymer is about 20 percent weight to about 80 percent weight; and

f. the weight percent of mono alkenyl arene in each B block is between about 10 percent and about 75 percent,

(2) about 10 to about 90 percent by weight of a styrene-isobutylene-styrene block copolymer; and

(3) optionally about 0 to about 40 percent by weight of an extender oil or tackifying resin wherein the total wt. % of the composition is 100 wt. %, wherein the composition has a light transmittance between about 70 to about 90% transmission, including all points in-between, according to ASTM D1003, and a haze between about 5 to about 50%, including all points in-between, according to ASTM D1003.

2. The composition according to claim 1, wherein the mono alkenyl arene is styrene.

3. The composition according to claim 1, wherein the conjugated diene is selected from the group consisting of butadiene and isoprene.

4. The composition according to claim 1, further comprising a tan delta value in the range of from about 0.80 to about 1.5.

5. The composition according to claim 1, further comprising an extender oil or tackifying resin in an amount between about 5 to about 40 weight percent.

6. The composition according to claim 1, further comprising between about 2 to about 40 weight percent of a cyclic-olefin copolymer.

7. The composition according to claim 1 wherein said total controlled distribution block copolymer contains about 30 to about 80 percent total styrene content.

8. The composition according to claim 1, further comprising between about 2 to about 40 phr of a cyclic-olefin copolymer and having a Shore A hardness greater than 80 according to ASTM D2240.

9. The composition according to claim 1, further comprising a Shore A hardness between about 20 to about 95 according to ASTM D2240.

10. The composition according to claim 1, wherein the melt index is from about 1 to about 100 grams/10 minutes according to ASTM D1238 at 230°

C. and 5 Kg weight.

11. The composition according to claim 1, further comprising an apparent thermal conductivity of about 0.14 W/m*K according to ASTM C518.

12. The composition according to claim 1, further comprising a tan delta value of the range from about 0.8 to about 1.5.

13. The composition according to claim 1, wherein the mono alkenyl arene is styrene and the conjugated diene is selected from the group consisting of butadiene and isoprene.

14. The composition according to claim 1, wherein each B block contains between about 5 wt % to about 10 wt % of a functionalized polymer.

15. The composition according to claim 1, wherein the melt index is from about 1 to about 100 grams/10 minutes according to ASTM D1238 at 230°

C. and 5 Kg weight.

16. The composition according to claim 1, wherein a Shore A hardness between about 20 to about 70, and a haze between about 10 to about 50% according to ASTM D1003.

17. The composition according to claim 1, further comprising between about 0 to about 0.5 weight percent of an antioxidant.

18. The composition according to claim 1, further comprising between about 0 to about 5 weight percent of a slip agent.

19. The composition according to claim 1, further comprising between about 0 to about 5 weight percent of a decolorizer.

20. The composition according to claim 1, further comprising between about 0 to about 5 weight percent of a blowing agent.

21. A block copolymer composition comprising:

(1) a. a hydrogenated block copolymer that has at least one block A and at least one block B, and wherein;

b. prior to hydrogenation each A block is a mono alkenyl arene homopolymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono alkenyl arene;

c. subsequent to hydrogenation about 0-10% of the arene double bonds have been reduced, and at least about 90% of the conjugated diene double bonds have been reduced;

d. each A block having a number average molecular weight between about 3,000 and about 60,000 and each B block having a number average molecular weight between about 30,000 and about 300,000;

e. each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono alkenyl arene units;

f. the total amount of mono alkenyl arene in the hydrogenated block copolymer is about 20 percent weight to about 50 percent weight;

(2) about 10 to about 90 percent by weight of an styrene-isobutylene-styrene block copolymer; and

(3) about 2 to about 40 percent by weight of an engineering thermoplastic,

wherein the composition has a light transmittance between about 70 to about 90% transmission, including all points in-between, according to ASTM D1003, and a haze between about 5 to about 50%, including all points in-between, according to ASTM D1003.

22. The composition according to claim 21, further comprising a tan delta value of the range from about 0.8 to about 1.5.

23. The composition according to claim 21, further comprising a Shore A hardness greater than 50 according to ASTM D2240.

24. The composition according to claim 21, further comprising a melt index from about 1 to about 100 grams/10 minutes according to ASTM D1238 at 230°

C. and 5 Kg weight.

25. The composition according to claim 21, further comprising a carbon dioxide permeability coefficient of less than 3×

10<sup>−

12</sup> (cc×

cm)/(cm²×

s×

Pa) as measured at 23°

C. and 0% relative humidity with 100% O₂ test gas concentration and 760 mmHg test gas pressure.

26. The composition according to claim 21, further comprising an oxygen permeability coefficient of about 0.1 to about 0.9×

10<sup>−

12</sup> (cc×

cm)/(cm²×

s×

Pa) as measured at 23°

C. and 0% relative humidity with 100% O₂ test gas concentration and 760 mmHg test gas pressure.

27. A block copolymer composition comprising:

(1) a hydrogenated block copolymer that has at least one block A and at least one block B, and wherein;

a. prior to hydrogenation each A block is a mono alkenyl arene homopolymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono alkenyl arene;

b. subsequent to hydrogenation about 0-10% of the arene double bonds have been reduced, and at least about 90% of the conjugated diene double bonds have been reduced;

c. each A block having a number average molecular weight between about 3,000 and about 60,000 and each B block having a number average molecular weight between about 30,000 and about 300,000;

d. each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono alkenyl arene units;

e. the total amount of mono alkenyl arene in the hydrogenated block copolymer is about 20 percent weight to about 80 percent weight; and

f. the weight percent of mono alkenyl arene in each B block is between about 10 percent and about 75 percent;

(2) about 10 to about 90 percent by weight of an styrene-isobutylene-styrene block copolymer;

(3) about 0 to about 40 percent by weight of an oil; and

(4) about 5 to about 30 percent by weight of a polyolefin or styrenic resin, wherein the composition has an oxygen permeability coefficient <

0.9×

10<sup>−

12</sup> (cc×

cm)/(cm²×

s×

Pa) as measured at 23°

C. and 0% relative humidity with 100% O₂ test gas concentration and 760 mmHg test gas pressure.

28. The composition according to claim 27, further comprising between about 0 to about 5 weight percent of a slip agent.

29. The composition according to claim 27, further comprising an extender oil in an amount between about 5 to about 40 weight percent.