Claims
- 1. A fully saturated aliphatic petroleum resin possessing in its backbone structure a preponderance of substituted cyclohexane rings and having a number average molecular weight of (Mn) of 400 to 800, a softening point of 40.degree. C. to 70.degree. C., a glass transition temperature (Tg) of less than 45.degree. C. and, when admixed at the total weight level of 60% with a polystyrene-hydrogenated polydiene-polystyrene saturated midblock thermoplastic elastomer of Mn from about 30,000 to about 200,000 as measured by GPC, provides a HMPSA having a rolling ball tack of less than 10 cm and a Polyken probe tack greater than 400 gm/cm.sup.2, said resin being produced by the Friedel-Crafts polymerization of a C.sub.5 -C.sub.6 fraction from steam cracked naphtha or light refinery streams having a boiling range from 20.degree. C. to 80.degree. C., said resin having a major proportion of the polymerizable content comprising piperylene and 2-methyl-2-butene or similar branched olefins.
- 2. The petroleum resin according to claim 1 having a glass transition temperature of from 10.degree. C. to 30.degree. C. and softening point in the range of 50.degree. C. to 65.degree. C.
- 3. The petroleum resin according to claim 2 wherein said admixture exhibits a rolling ball tack of from 2 to 6 cm. and a Polyken probe tack of at least 600.
- 4. A hot melt pressure sensitive adhesive (HMPSA) formulation comprising (a) a saturated midblock thermoplastic elastomer and (b) about 100 to 180 parts by weight per 100 parts by weight of said elastomer of a fully saturated aliphatic petroleum resin possessing in its backbone structure a preponderance of substituted cyclohexane rings and having a number average molecular weight (Mn) of 400 to 800, a softening point of 40.degree. C. to 70.degree. C., a glass transition temperature (Tg) of less than 45.degree. C. and, when admixed at the total weight level of 60% with a polystyrene-hydrogenated polydiene-polystyrene saturated midblock thermoplastic elastomer of Mn from about 30,000 to about 200,000 as measured by GPC, provides a HMPSA having a rolling ball tack of less than 10 cm and a Polyken probe tack greater than 400 gm/cm.sup.2, said resin being produced by the Friedel-Crafts polymerization of a C.sub.5 -C.sub.6 fraction from steam cracked naphtha or light refinery streams having a boiling range from 20.degree. C. to 80.degree. C., said resin having a major proportion of the polymerizable content comprising piperylene and 2-methyl-2-butene or similar branched olefins.
- 5. A HMPSA formulation according to claim 4 containing up to 2 weight percent of an antioxidant.
- 6. A HMPSA formulation according to claim 4 wherein said elastomer is a block copolymer of styrene and hydrogenated polydiene of Mn from about 30,000 to about 200,000 as measured by GPC.
- 7. A pressure sensitive adhesive formulation according to claim 6 containing a naphtha solvent, said elastomer and saturated petroleum resin being dissolved in said solvent at a concentration level of 35 to about 55 weight percent based on the total weight of said composition.
Parent Case Info
This is a continuation of application Ser. No. 511,518 filed July 7, 1983, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
001306 |
Apr 1979 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
511518 |
Jul 1983 |
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