Claims
- 1. A method for adhering two surfaces which comprises:
- A. friction rubbing of a thermoplastic, pressure-sensitive adhesive mass on a first surface and deposition of adhesive thereon by such friction rubbing;
- B. placing a second surface in contact with said deposited adhesive and applying pressure on the two surfaces in contact with the adhesive to form a bond wherein the adhesive consists essentially of a mixture of:
- a. about 40% to 75% by weight of polyisobutylene having a Flory molecular weight of from about 40,000 to 70,000;
- b. about 25% to 60% by weight of a wax having a melting point of at least 165.degree. F. and a needle penetration value of from about 1 to 15; and
- C. from 0% to 30% by weight of an adhesion promoter resin for the polyisobutylene and having a softening point above 150.degree. F.; and provided that the wax has a needle penetration value of not greater than 8 when the mass contains at least 10% resin.
- 2. The method of claim 1 wherein the wax is a wax having a melting point of 190.degree. F. to 240.degree. F. and a needle penetration value of about 1 to 6.
- 3. The method of claim 1 wherein:
- A. the quantity of polyisobutylene is from 40% to 65% and has a molecular weight of 45,000 to 65,000;
- B. the quantity of wax is from 40% to 55%; and
- C. wherein the polyisobutylene and wax compose at least 95% of said adhesive.
- 4. The method of claim 1 wherein:
- A the quantity of polyisobutylene is from 40% to 65% and the molecular weight is from about 45,000 to 65,000;
- B the quantity of wax is from 25% to 60%; and
- C the quantity of adhesion promoter resin is from about 5% to 30%.
- 5. The method of claim 1 wherein the adhesive mass is sized and shaped as a crayon adhesive.
- 6. The method of claim 4 wherein the adhesion promoter resin is a member selected from the group consisting of an aliphatic C-5 hydrocarbon resin, a rosin ester and a polymerized terpene.
- 7. A method for adhering two surfaces which comprises:
- A. friction rubbing a thermoplastic, normally tacky, pressure sensitive adhesive mass on a smooth, dry, paperlike first surface to produce frictional heat to soften the adhesive and transfer softened adhesive to the paperlike surface;
- B. placing a second paperlike surface in contact with the transferred adhesive and applying pressure on the two surfaces in contact with the adhesive to form an adhesive bond wherein the adhesive mass consists essentially of a mixture of:
- (a) from about 40% to 75% by weight of polyisobutylene having a Flory molecular weight of 40,000 to 70,000;
- (b) about 25% to 60% by weight of wax having a needle penetration value of from about 1 to 15 and a melting point of at least 165.degree. F.; and
- (c) optionally containing up to about 30% by weight of an adhesion promoter resin for the polyisobutylene wherein said resin has a softening point above 150.degree. F. and is prepared from monomers having at least 5 carbon atoms; and provided that the wax has a needle penetration value of not greater than 8 when at least 10% of adhesion promoter resin is in the composition.
- 8. The method of claim 7 wherein the adhesion promoter resin is a member selected from the group consisting of rosin, modified rosin, a rosin derivative, a terpene resin, a hydrogenated resin, a resin prepared from a C-5 aliphatic hydrocarbon, and a resin prepared from a mixture of a C-5 aliphatic and a C-9 aromatic hydrocarbon.
- 9. The method of claim 8 wherein the quantity of adhesion promoter resin is from about 5% to 25% by weight of the adhesive mass.
- 10. The method of claim 9 wherein the adhesion promoter resin is a member selected from the group consisting of an aliphatic C-5 hydrocarbon resin, a rosin ester, and a polymerized terpene.
- 11. The method of claim 10 wherein the quantity of polyisobutylene is from about 40% to 65%.
- 12. The method of claim 8 wherein the wax is a synthetic wax having a needle penetration value of from about 1 to 6.
- 13. The method of claim 12 wherein the wax is a polyethylene wax.
- 14. The method of claim 7 wherein the adhesive mass contains from about 40% to 55% of a wax having a melting point of 190.degree. F. to 240.degree. F.
- 15. The method of claim 7 wherein the adhesive mass contains from about 0.1% to 5% of a filler.
- 16. A method for adhering two surfaces which comprises:
- A. friction rubbing of a thermoplastic, pressure-sensitive, normally tacky crayon adhesive on a first surface and deposition of adhesive thereon by such friction rubbing;
- B. placing a second surface in contact with said deposited adhesive and applying pressure on the two surfaces in contact with the adhesive to form a bond wherein the adhesive consists essentially of a mixture of:
- a. about 40% to 75% by weight of polyisobutylene having a Flory molecular weight of from about 40,000 to 70,000;
- b. about 25% to 60% by weight of a wax having a melting point of at least 165.degree. F. and a needle penetration value of from about 1 to 6; and
- c. from about 10% to 20% of an adhesion promoter resin for the polyisobutylene, said resin having a softening point of about 176.degree. F. to 248.degree. F. and said resin being a member selected from the group consisting of rosin, modified rosin, a rosin derivative, a terpene resin, a hydrogenated resin, a resin prepared from a C-5 aliphatic hydrocarbon, and a resin prepared from a mixture of a C-5 aliphatic and a C-9 aromatic hydrocarbon.
- 17. The method of claim 16 wherein the wax is a polyethylene wax.
- 18. The method of claim 17 wherein the pressure applied to the two surfaces is from about 10 to 20 pounds per square inch and the adhesive bond is permanent.
Parent Case Info
This application is a divisional of our application Ser. No. 07/855,919 which was filed on Mar. 23, 1992 now U.S. Pat. No. 5,331,023.
US Referenced Citations (19)
Foreign Referenced Citations (2)
Number |
Date |
Country |
59-187069 |
Oct 1984 |
JPX |
692945 |
Jun 1953 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
855919 |
Mar 1992 |
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