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Adhesives and Rubbers

Hot-melt-adhesive

Graft polymers of vinyl chloride on unsaturated olefinic elastomers and process for the preparation thereof

Having thus described our invention, what we desire to secure by Letters Patent and hereby claim is:...

Method of polymerizing vinyl halide with olefin polymers and copolymers and compositions thereof

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Method of preparing vinyl halide polymers and copolymers with polyolefins

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Hot melt adhesive

Details

Inventors: Koprowicz, George; Czaplewski, Patrick; Kaczkowski, Michael;
Assignee: Findley Adhesives, Inc. (Wauwatosa, WI)
Primary Examiner: Jacobs; Lewis T.
Assistant Examiner:
Attorney, Agent or Firm: Godfrey & Kanh, S.C.

Hot melt adhesive compositions for bonding rigid polypropylene substrates comprise intimate blends of an amorphous copolyolefin copolymer, a polyolefin wax, a rosin-based ester resin and a polybutylene copolymer.

DETAILED DESCRIPTION What is claimed is: 1.
A hot melt adhesive composition for bonding polypropylene substrates, said composition comprising: (a) about 20% to abut 35% by weight of an amorphous copolyolefin copolymer; (b) about 5% to about 15% by weight of a polyolefin wax; (c) about 20% to about 35% by weight of a rosin-based ester resin; and (d) about 20% to about 35% by weight of a polybutylene copolymer.
2.
A composition of claim 1 wherein the amorphous copolyolefin copolymer is selected from copolymers made up of the following combinations of alternating repeating monomeric units; ethylene and propylene; ethylene and butene; propylene and butene; and ethylene, propylene and butene.
3.
A composition of claim 1 which contains an antioxidant/stabilizer.
4.
A composition of claim 1 wherein the polyolefin wax is a polymeric long chain entity comprised of repeating olefinic monomer units.
5.
A composition of claim 1 wherein the rosin-based ester resin is selected from glycerol and pentaerythritol esters of natural and modified wood rosins.
6.
A composition of claim 1 wherein the polybutylene copolymer component comprises about at least 89% butene monomeric units.

Description:
FIELD OF THE INVENTION The present invention relates to hot melt adhesives.
More particularly, it relates to hot melt adhesives for bonding together rigid polypropylene substrates.
BACKGROUND OF THE INVENTION The automotive industry is attempting to replace metal and other materials with plastics, such as rigid polypropylene, which are light and can be readily molded into complex shapes.
However, the bonding of two parts or substrates of rigid polypropylene which is the preferred plastic does present problems.
It is generally believed that in order to develop an acceptable and effective bond between two substrates of rigid polypropylene a "pretreatment" of the substrates must first be effected.
The pretreatment can consist of exposure to corona discharge/static discharge, flame pretreatments are not always safe, effective and efficient

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