Highly asymmetric triblock polymer compositions and methods of making same
AssigneeKraton Polymers LLC
InventorsDonn Dubois, Martine Dupont, Carl Willis, Robert Q. Kluttz
Life of this patent
Estimating the term…
Abstract
A styrenic triblock copolymer composition with a combination of excellent tensile strength and high melt index, excellent for manufacturing, finishing and handling, forming stable pellets, for use in applications including but not limited to adhesive, coating, and flexographic printing. The composition comprises a first block which is a polymer of a monoalkenyl arene; a second block which is polymer of a conjugated diene and a third block which is a polymer of a monoalkenyl arene wherein a peak molecular weight of the third block is from about 0.06 to about 0.4 times that of the first block.
Claims17
An adhesive composition comprising:
- from 30 to 60 wt. % of a highly asymmetric triblock (“HAT”) copolymer,
- from 30% wt. to 60% wt. of a tackifying resin,
- from 0 to 45 wt. % of an oil,
- and from 0.1 to 3 wt. % of an anti-oxidant, wherein the wt. % is based on the total weight of the adhesive composition;
- wherein the HAT copolymer comprises a first block which is a polymer of a monoalkenyl arene, a second block which is a polymer consisting of a conjugated diene, and a third block which is a polymer of a monoalkenyl arene, wherein:
- the block copolymer has a peak molecular weight ranging from 10,000 to 500,000 g/mol,
- the third block has a peak molecular weight ranging from 0.06 to 0.4 of the peak molecular weight of the first block;
- and
- wherein the HAT copolymer has a total arene content ranging from 15 to 40 wt. %.
Dependencies are inferred from the claim text.