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US 4,286,077 AGranted
Weather resistant adhesive composition
AssigneeShell Oil Company
InventorsDavid J. St. Clair, Earle E. Ewins
Life of this patent
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Abstract
A weather resistant adhesive composition possessing an excellent balance of properties including good tack and low melt viscosity comprises a selectively hydrogenated monoalkenyl arene/conjugated diene block copolymer component having certain block molecular weights, tackifying resin, and plasticizer.
Claims13
A weather resistant pressure sensitive adhesive composition possessing excellent oxidative and UV stability along with improved tack and reduced melt viscosity comprising:
- (a) 100 parts by weight of a selectively hydrogenated block copolymer component comprising an A'B' block copolymer and a multiblock copolymer having at least two end blocks A and at least one mid block B wherein the A' and A blocks are monoalkenyl arene polymer blocks and the B' and B blocks are substantially completely hydrogenated conjugated diene polymer blocks, the number average molecular weight of the A' and A blocks are between about 3,000 and about 7,000, the monoalkenyl arene content of the multiblock copolymer is between about 7% and about 22% by weight and the weight ratio between the A'B' block copolymer and the multiblock copolymer is about 0:100 to about 75:25;
- (b) about 50 to about 350 parts by weight of a tackifying resin compatible with block B;
- and
- (c) about 0 to about 100 parts by weight of a plasticizer.
1 more element
Dependencies are inferred from the claim text.