Polyurethane adhesive

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...

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Details

525 63, 525 66, 525126, 525127, 525129, 525130, 525131, 524273, 524274, C08L 5108, C08L 7506

Patent

active

047286849

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a polyurethane adhesive, more particularly an organic solution type polyurethane adhesive which exhibits particularly excellent adhesion where at least one of the substances to be adhered is a polyvinyl chloride sheet or film.


BACKGROUND OF THE INVENTION

Since a solution type polyurethane adhesive has excellent flexibility and excellent resistance to a plasticizer, it has hitherto been used as an all-round adhesive in various fields for adhering shaped products (e.g sheet and film) made from polyvinyl chloride which contain a large amount of a plasticizer with other plastic substances, wooden products or metallic products. However, it has still been desired to develop an improved adhesive having excellent heat resistance and improved performance and being capable of preventing lowering of adhesion which is induced by migration of the plasticizer from the substance to be adhered to the interface thereof. Moreover, the solvent solution type adhesive comprising a urethane rubber has less tack strength, and hence, for effecting the required adhesion, it is required to take such steps as applying the adhesive to both surfaces of the substances to be adhered, after taking some open time for drying the solvent, piling both surfaces against each other, pressing the piled substances, and further tacking temporarily by some means until adhesion by the adhesive is completed


OBJECT OF THE INVENTION

The present inventors have intensively studied on the development of an improved adhesive whose adhesion is less influenced by the plasticizer contained in the substances to be adhered, and it has been found that there can be obtained the desired polyurethane adhesive having excellent resistance against plasticizer by dissolving a thermoplastic polyester urethane rubber in an organic solvent, grafting a monomer suitable for preparing an acrylic resin to said rubber, and adding thereto a chlorinated rubber to obtain a main adhesive ingredient, and then combining the main adhesive ingredient with an isocyanate compound as a crosslinking agent. Then, the present invention has been completed. The present inventors have further found that by incorporating a specific polyoxyalkyl ether polyol to the above main adhesive ingredient, the adhesive shows highly improved heat aging resistance and heat creep resistance, and further that by incorporating a specific rosin resin or rosin resin derivative to the adhesive, it shows further improved initial adhesion to a plasticizer-containing soft polyvinyl chloride material, and owing to the tack strength, it can exhibit excellent adhesion without necessity of temporary tacking means, even less pressing of the substances coated by the adhesive, and further, even by applying the adhesive only to one of the substances to be adhered.
An object of the present invention is to provide a polyurethane adhesive which can exhibit excellent adhesive with heat aging resistance and heat resistance even in case of applying to substances to be adhered, at least one of which is a polyvinyl chloride sheet or film containing a large amount of a plasticizer. Another object of the invention is to provide a polyurethane adhesive having improved heat aging resistance and heat creep resistance. A further object of the invention is to provide a polyurethane adhesive having improved initial adhesion to a plasticizer-containing soft polyvinyl chloride substance.


SUMMARY OF THE INVENTION

The present invention relates to a polyurethane adhesive which comprises (a) a thermoplastic polyurethane rubber (hereinafter referred to as "urethane rubber") which is grafted with at least one of the compounds selected from the group consisting of acrylic acid, an acrylic ester, methacrylic acid and a methacrylic ester (hereinafter referred to as "graft rubber"), (b) a chlorinated rubber, and (c) an isocyanate compound as a crosslinking agent, and optionally (d) a polyoxyalkylene ether polyol containing two or more ether bonds within the molecule and/or (e) a rosin r

REFERENCES:
patent: 3337481 (1967-08-01), Singelyn et al.
patent: 3914484 (1975-09-01), Creegar et al.
patent: 3935144 (1976-01-01), Hagenweiler et al.
patent: 3947403 (1976-03-01), McCready
patent: 4035440 (1977-07-01), Khanna et al.
patent: 4181781 (1980-01-01), Chandolla et al.
patent: 4268646 (1981-05-01), Agger et al.
patent: 4312972 (1982-01-01), Khanna
patent: 4332716 (1982-06-01), Shah
patent: 4439587 (1984-03-01), Martinez et al.
patent: 4569972 (1986-02-01), Legoe et al.

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