Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1988-08-08
1991-05-07
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524552, 524571, 524572, 524574, 524575, 5245755, 525 98, 525191, 525215, 525232, 525240, 525918, 5263484, 156334, C08K 501, C08L 2320, C09J 1108
Patent
active
050137859
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to tackifiers for adhesives comprising specific olefinic polymers (hereinafter sometimes referred to as tacky producers)
BACKGROUND ART
Cationic polymers obtained by cationic polymerization of branched alpha-olefins such as 4-methyl-1-pentene have been long known. For example, Japanese Patent Publn. No. 24480/1965 describes a process for polymerizing 3-methyl-1-butene or 4-methyl-1-pentene at low temperatures and suggests that the resulting crystalline polymers are suitable for producing plastics films or sheets. Said Japanese Patent Publn. describes that when an alpha-isomonoolefin is polymerized in the presence of a Friedel-Crafts type catalyst at a temperature of from -10.degree. C. to 100.degree. C., amorphous polymers are obtained and that the amorphous polymers are suitable for use as paints, varnish lacquers, other additives, plasticizers, reinforcing agents and diluents. Further, U.S. Pat. No. 3,299,022 describes homopolymers of branched alpha-olefins and copolymers thereof, and discloses that polymers having molecular weights of from 1,500,000 to 2,000,000 are amorphous viscoelastic solids. Furthermore, U.S. Pat. No. 3,317,501 describes cationic polymers of 4-methyl-1-pentene and discloses that polymers having molecular weights of no more than 5,000, which are obtained by polymerizing 4-methyl-1-pentene in the presence of an AlCl.sub.3 catalyst at a temperature of from 54.degree. to 170.degree. F., are tacky oils. Moreover, this patent describes that when the polymers having elasticity are mixed with polypropylene, the low-temperature impact resistance of the resulting polypropylene is improved. Further, Macromolecules, Vol, 10, No. 1 pp. 188 discloses that cationic polymers of 4-methyl-1-pentene have five structures.
We have carried out studies with respect to cationic polymers of branched alpha-olefins such as 4-methyl-1-pentene having specific properties, and have now found that these polymers are excellent as a tackifier for an adhesive which is not described in the literatures described above.
DISCLOSURE OF INVENTION
A tackifier for an adhesive according to the present invention is characterized in that it comprises a polymer having a number average moleculer weight (Mn) of from 200 to 40,000 and a glass transition point of from -75.degree. C. to +10.degree. C. which is obtained by the cationic polymerization of a branched alpha-olefin. The polymer is used as an adhesive or a tackifier for an adhesive.
BEST MODE FOR CARRYING OUT THE INVENTION
Tackifiers for adhesives according to the present invention will be described in greater detail hereinafter.
Branched alpha-olefin
Examples of branched alpha-olefins which constitute polymers according to the present invention include 3-methyl-1-butene, 4-methyl-1-pentene, 5-methyl-1-hexene, 3-methyl-1-pentene, 3-methyl-1-hexene, 4-methyl-1-hexene, 4-methyl-1-heptene, 5-methyl-1-heptene, and 3-methyl-1-pentene. Of these, 4-methyl-1-pentene is preferable. These branched alpha-olefins can be used alone or in mixture.
Polymerization Conditions
In polymerizing the branched alpha-olefin as described above, Friedel-Crafts type catalysts such as AlCl.sub.3, C.sub.2 H.sub.5 AlCl.sub.2, (C.sub.2 H.sub.5).sub.2 AlCl, AlBr.sub.3, and SnCl.sub.4 ; and alkyl halides such as (CH.sub.3).sub.3 C Cl, C.sub.2 H.sub.5 Br, C.sub.2 H.sub.5 Cl and CH.sub.3 Cl are used as the polymerization catalyst alone or in combination. These catalysts can be optionally used in combination with a co-catalyst such as CH.sub.2 .dbd.CHCl.
A solvent is not necessarily used because the aforementioned alkyl halide per se acts as a solvent. Solvents such as hexane and heptane may be used.
The polymerization temperature is usually within the range of from +80.degree. C. to -100.degree. C., and particularly preferably from +30.degree. C. to -60.degree. C. Conditions other than the conditions described above can be suitably selected from those described in the known technical literatures described above. Polymerization which proceeds unde
REFERENCES:
patent: 3299022 (1967-01-01), Edwards
patent: 3317501 (1967-05-01), Edwards
Richards, Butyl Rubber and Polyisobutylene, Handbook of Adhesives, Skeist (ed), Van Nostrand Reinhold, N.Y., 221-23, 1962.
Kennedy et al., Crystalline Poly(3-methyl Butene-1) Obtained by Cationic Polymerization, Die Makromolekulare Chemie, 53, 28-32 (1962).
Derwent Abstract, JP-A-57 021 472 (Mitsui Petrochem. Inc. K.K.) 4/2/82, (Abstract).
Mitsui Petrochemical Industries Ltd.
Teskin Fred
LandOfFree
Pressure-sensitive adhesive composition comprising poly-4-methyl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure-sensitive adhesive composition comprising poly-4-methyl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure-sensitive adhesive composition comprising poly-4-methyl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-940238