Claims
- 1. A hot melt adhesive comprising tackifier and syndiotactic propylene homopolymer or copolymer, said homopolymer or the propylene segment of the copolymer comprising at least about 80% racemic dyads and said homopolymer or copolymer having a melting point of from 100.degree. C. to 180.degree. C.
- 2. The hot melt adhesive of claim 1, wherein said homopolymer or propylene segment of the copolymer comprises at least 85% racemic dyads.
- 3. The hot melt adhesive of claim 1, wherein said copolymer comprises ethylene comonomer.
- 4. The hot melt adhesive of claim 1, wherein the comonomer of the copolymer is a C.sub.4 to C.sub.12 alpha-olefin.
- 5. The hot melt adhesive of claim 1, wherein the copolymer comonomer is selected from the group consisting of 1-pentene, 1-hexene, 1-heptene and 1-octene.
- 6. The hot melt adhesive of claim 1, wherein said copolymer comprises 1-hexene.
- 7. The hot melt adhesive of claim 4, wherein said copolymer comprises 1 to 50 weight % of comonomer.
- 8. The hot melt adhesive of claim 4, wherein said copolymer comprises 3 to 20 weight % of comonomer.
- 9. The hot melt adhesive of claim 4, wherein the comonomer is hexene-1 and is present at 3 to 20 weight %.
- 10. The hot melt adhesive of claim 1, wherein the copolymer comprises 5 to 18 weight % hexene-1.
- 11. The hot melt adhesive of claim 1, wherein the tackifier is present at 1 to 70 weight %.
- 12. The adhesive of claim 1, wherein the tackifier is present at 40 to 60 weight %.
- 13. The adhesive of claim 1, wherein the tackifier is a hydrogenated resin.
- 14. The adhesive of claim 1, wherein the tackifier is a hydrogenated cyclic resin.
- 15. The adhesive of claim 1, wherein the tackifier is an aliphatic resin with a softening point of about 12.degree. to about 100.degree. C.
- 16. The adhesive of claim 1, where the syndiotactic propylene homopolymer or copolymer is deashed.
- 17. The holt melt adhesive of claim 1, wherein the propylene polymer is said propylene homopolymer.
- 18. A hot melt adhesive produced by a process comprising combining tackifier with syndiotactic propylene homopolymer or copolymer, said homopolymer or the propylene segment of the copolymer comprising at least about 80% racemix dyads and said homopolymer or copolymer further having a melting point of from 100.degree. to 180.degree. C. wherein the hot melt adhesive is characterized by an open time of 5 minutes or more.
- 19. The product of claim 18, wherein the hot melt adhesive is characterized by a peel strength after 24 hours at or above the peel strength at 10 minutes.
- 20. The product of claim 18, wherein the hot melt adhesive is characterized by a peel strength after 24 hours about the same or above the peel strength at 10 minutes.
- 21. The product of claim 18, wherein the hot melt adhesive is characterized by an open time of about ten minutes or more.
Parent Case Info
This invention is a continuation-in-part of U.S. Ser. No 610,219, filed Nov. 9, 1990, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
Country |
351392 |
May 1989 |
EPX |
387690 |
Sep 1990 |
EPX |
387691 |
Sep 1990 |
EPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
610219 |
Nov 1990 |
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