Microgel-containing vulcanisable composition
View Patent ↗The present invention concerns a vulcanizable composition, vulcanized products produced from it, and their use in particular in the production of golf balls or roll coverings.
1. A vucanizable composition, comprising:
a) at least one diene rubber,
b) at least one unsaturated carboxylic acid or a salt thereof,
c) at least one peroxide,
d) at least one microgel; and
f) a high-density additive comprising barium sulfate and carbon black,
wherein upon the vulcanization of the vucanizable composition, a vulcanized product is thereby formed having a Mooney Viscosity (ML 1+4) of less than or equal to 47 and a Shore A Hardness at 70° C. of greater than or equal to 87.
2. The vucanizable composition according to claim 1 , wherein the diene rubber is selected from the group consisting of:
natural rubber (NR), styrene/isoprene/butadiene rubber (SIBR), polybutadiene rubber (BR), styrene/butadiene/acrylonitrile rubber (SNBR), polychloroprene (CR), butadiene/acrylic acid (ABR), C1-4 alkyl ester copolymers, polyisoprene (IR), random styrene-butadiene copolymers (SBR), carboxylated styrene-butadiene copolymers (X-SBR), fluororubber (FKM), acrylate rubber (ACM), polybutadiene-acrylonitrile copolymers (NBR), carboxylated nitrile rubbers (X-NBR), isobutylene/isoprene copolymers (IIR), brominated isobutylene/isoprene copolymers (BIIR), chlorinated isobutylene/isoprene copolymers (CIIR), ethylene/propylene copolymers (EPM), ethylene-propylene-diene copolymers (EPDM), ethylene/acrylate copolymers (EAM), ethylene/vinyl acetate copolymers (EVM), chlorohydrin rubber (CO), epichlorohydrin rubber (ECO), silicone rubbers (Q), polyester urethane polymers (AU), polyether urethane polymers (EU), epoxydised natural rubber (ENR), and mixtures thereof.
3. The vucanizable composition according to claim 1 , wherein the diene rubber is polybutadiene.
4. The vucanizable composition according to claim 3 , wherein the polybutadiene, has a cis content greater than 90%.
5. The vucanizable composition according to claim 1 , wherein the unsaturated carboxylic acid or salt thereof is a metal diacrylate.
6. The vucanizable composition according to claim 1 , wherein the unsaturated carboxylic acid or salt thereof is a metal dimethacrylate.
7. The vucanizable composition according to claim 1 , wherein the unsaturated carboxylic acid or salt thereof is a zinc salt.
8. The vucanizable composition according to claim 1 , wherein the peroxide is an organic peroxide.
9. The vucanizable composition according to claim 1 , further comprising:
e) at least one conventional rubber additive, said at least one conventional additive being present in the amount of up to 50 phr, and further wherein the at least one unsaturated carboxylic acids or salts thereof is present in the amount of 5 to 70 phr, the at least one peroxide is present in the amount of 0.2 to 5 phr, and the at least one microgel is present in the amount of 5 to 60 phr.
10. The vucanizable composition according to claim 1 , wherein the microgel is a crosslinked microgel.
11. The vucanizable composition according to claim 1 , wherein the microgel comprises primary particles and wherein said primary particles have an almost spherical geometry.
12. The vucanizable composition according to claim 11 , wherein the primary particles have an average particle size of 5 to 500 nm.
13. The vucanizable composition according to claim 1 , wherein the microgel comprises at least one fraction that that is insoluble in toluene at 23° C. of at least around 70 wt. %.
14. The vucanizable composition according to claim 1 , wherein the microgel has a swelling index in toluene at 23° C. of less than around 80.
15. The vucanizable composition according to claim 1 , wherein the microgel has a glass transition temperature of −100° C. to +100° C.
16. The vucanizable composition according to claim 1 , wherein the microgel is obtained via emulsion polymerization.
17. The vulcanized product obtained by the vulcanization of the vulcanizable composition according to claim 1 .
18. A process for producing the vulcanized product comprising:
vulcanizing the vulcanizable composition according to claim 1 .
19. A golf ball comprising the vulcanized product according to claim 17 .
20. A table tennis paddle-coating, comprising the vulcanized product according to claim 17 .
21. A roll, comprising: a covering comprising the vulcanized product according to claim 17 .
22. The composition according to claim 2 , wherein the random styrene-butadiene copolymers have a styrene content of 1 to 60 percent by weight.
23. The composition according to claim 2 , wherein the random styrene-butadiene copolymers, have a styrene content of 5 to 50 percent by weight.
24. The composition according to claim 2 , wherein the polybutadiene-acrylonitrile copolymers have an acrylonitrile content of 5 to 60 percent by weight.
25. The composition according to claim 2 , wherein the polybutadiene-acrylonitrile copolymers have an acrylonitrile content of 10 to 50 percent by weight.
26. The composition according to claim 2 , wherein the isobutylene/isoprene copolymers, have an isoprene content of 0.5 to 10 percent by weight.
27. The composition according to claim 2 , wherein the brominated isobutylene/isoprene copolymers, have a bromine content of 0.1 to 10 percent by weight.
28. The composition according to claim 2 , wherein the chlorinated isobutylene/isoprene copolymers have a bromine content of 0.1 to 10 percent by weight.
29. The vucanizable composition according to claim 8 , wherein the organic peroxide is selected from the group consisting of:
dicumyl peroxide, t-butylcumyl peroxide, bis-(t-butylperoxyisopropyl)benzene, di-t-butyl peroxide, 2,5-dimethylhexane-2,5-dihydroperoxide, 2,5-dimethylhexyne-3,2,5-dihydroperoxide, dibenzoyl peroxide, bis-(2,4-dichlorobenzoyl)peroxide, t-butyl perbenzoate, 4,4-di-(t-butylperoxy)valeric acid butyl ester, and 1,1-bis-(t-butylperoxy)-3,3,5-trimethyl cyclohexane.