Blends of substantially amorphous olefin copolymers and compatib

Details Blends of substantially amorphous olefin copolymers and compatib Blends of substantially amorphous olefin copolymers and compatib

1977-11-07

1979-09-25

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525216, 525232, C08L 2312, C08L 2318, C08L 2320

Patent

active

041691164

ABSTRACT:
This invention relates to blends of compatible tackifiers with substantially amorphous olefin copolymers containing at least one C.sub.3 to C.sub.5 linear .alpha.-olefin and 40 to 60 mole percent of at least one C.sub.6 to C.sub.10 linear .alpha.-olefin which are useful as hot-melt, pressure-sensitive adhesives. The unmodified copolymer base resins have melt viscosities in the range of >75,000 cp up to about 1,000,000 cp at 190.degree. C. The addition of the compatible tackifiers to the copolymer base resin causes a dramatic and unexpected increase in the shear adhesion failure time in addition to improved coatability as well as substantial increases in probe tack and peel adhesion values of the copolymers.

REFERENCES:
patent: 3356766 (1967-12-01), Ware
patent: 3900694 (1975-08-01), Jurrens
patent: 3954697 (1976-05-01), McConnell et al.

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