Rubber compositions with building tack
View Patent ↗The invention relates to a rubber composition comprising a natural or synthetic rubber or a mixture of such rubbers, a tackifier, and optionally further additives, wherein the tackifier is prepared from a rosin and an alkylphenol aldehyde resin of the resol type, which rubber composition has a good building tack and tack retention.
1. A rubber composition comprising a natural or synthetic rubber or a mixture of such rubbers, a tackifier, and optionally further additives, characterized in that the tackifier is prepared from a rosin and an alkylphenol aldehyde resin of the resol type, further characterized in that the tackifier has an acid number of about 70 to 120.
2. The rubber composition according to claim 1 , wherein the synthetic rubber is selected from the group consisting of butadiene rubber, styrene-butadiene rubber, halogenated isoprene isobutylene rubber, nitril rubber, hydrogenated nitril rubber, EPDM and chloropren rubber or mixtures thereof.
3. The rubber composition according to claim 1 , wherein the rosin is selected from the group consisting of gum rosin, tall oil rosin or wood rosin or mixtures thereof.
4. The rubber composition according to claim 3 , wherein the alkylphenol is selected from the group consisting of (para)-tert. -butylphenol, (para)-nonylphenol, (para)-octylphenol, (para)-tert. -octylphenol or mixtures thereof.
5. The rubber composition according to claim 3 wherein the aldehyde is selected from the group consisting of formaldehyde, acetaldehyde and propionic aldehyde.
6. The rubber composition according to claim 3 , wherein the tackifier is prepared with a mole ratio of resol to rosin of from 2.0 to 6.0.
7. The rubber composition according to claim 6 , wherein the tackifier is prepared with a mole ratio of resol to rosin of from 2.2 to 5.6.
8. The rubber composition according to claim 7 , wherein the tackifier is prepared with a mole ratio of resol to rosin of 3.93.
9. The rubber composition according to any one of the preceding claims, wherein the resol is prepared with a mole ratio of (form)aldehyde to (para)-alkylphenol of from 1.01 to 2.3.
10. The rubber composition according to claim 9 , wherein the resol is prepared with a mole ratio of (form)aldehyde to (para)alkylphenolof from 1:1 to 1.9.
11. The rubber composition according to claim 10 , wherein the resol is prepared with a mole ratio of (form)aldehyde to (para)alkylphenol of 1.34.
12. A method of incorporating a tackifier into a sidewall rubber compound, comprising:
preparing a rubber compound mixture comprising mixing one or more rubber compounds comprising natural or synthetic rubbers or a mixture of such rubbers and one or more additives comprising carbon black, antioxidant, zinc oxide, paraffin wax and aromatic oil; and thereafter
adding a tackifier to the rubber compound mixture, wherein the tackifier is prepared from a rosin resol resin, wherein the rosin resol resin is prepared from a rosin and an alklyphenol aldehyde resin of the resol type;
wherein the tackifier has an acid number of about 70 to 120.
13. The method of claim 12 , wherein the synthetic rubber is selected from the group consisting of butadiene rubber, styrene-butadiene rubber, halogenated isopren isobutylene rubber, nitril rubber, hydrogenated nitril rubber, EPDM and chloropren rubber or mixtures thereof.
14. The method of to claim 13 , wherein the rosin is selected from the group consisting of gum rosin, tall oil rosin or wood rosin or mixtures thereof.
15. The method of claim 14 , wherein the alkylphenol is selected from the group consisting of (para)tert.-butylphenol, (para)-nonylphenol, (para)-octylphenol, (para)-tert.-octylphenol or mixtures thereof
16. The method of claim 15 , wherein the aldehyde is selected from the group consisting of formaldehyde, acetaldehyde and propionic aldehyde.
17. The method of any of claims 12 to 16 , wherein the rosin resol resin is prepared with a mole ratio of resol to rosin of from 2.0 to 6.0.
18. The method of claim 17 , wherein the rosin resol resin is prepared with a mole ratio of resol to rosin of from 2.2 to 5.6.
19. The method of claim 18 , wherein the rosin resol resin is prepared with a mole ratio of resol to rosin of 3.93.
20. The method of claim 19 , wherein the resol is prepared with a mole ratio of (form)aldehyde to (para)-alkylphenol of from 1.01 to 2.3.
21. The method of claim 20 , wherein the resol is prepared with a mole ratio of (form) aldehyde to (para)-alkylphenol of from 1.1 to 1.9.
22. The method of claim 21 , wherein the with a mole ratio of (form) aldehyde to of 1.34.