Hydrogenated block copolymer compositions
AssigneeDow Global Technologies LLC
InventorsFrank S. Bates, Chin Chu, Glenn H. Fredrickson, Stephen F. Hahn, Mary Ann Jones, Jerry L. Hahnfeld
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Abstract
The present invention relates to hydrogenated block copolymers of vinyl aromatic polymer blocks and conjugated diene polymer blocks having specific total Mn and specific block Mn's such that advantageous properties are attained. The present invention also relates to hydrogenated pentablock copolymers thereof and specifically hydrogenated pentablock copolymers useful in thin walled injection molding applications.
Claims41
A hydrogenated block copolymer comprising at least two distinct blocks of hydrogenated vinyl aromatic polymer, and at least one block of hydrogenated conjugated diene polymer, characterized by:
- a) a total number average molecular weight (Mnt) of from 30,000 to 120,000, wherein each hydrogenated vinyl aromatic polymer block (A) has a Mna of from 5,000 to 50,000 and the hydrogenated conjugated diene polymer block (B) has a Mnb of from 4,000 to 110,000;
- and
- b) a hydrogenation level such that each hydrogenated vinyl aromatic polymer block has a hydrogenation level of greater than 90 percent and the hydrogenated conjugated diene polymer block has a hydrogenation level of greater than 95 percent;
- wherein the hydrogenated block copolymer comprises at least 65 weight percent of hydrogenated vinyl aromatic polymer block, based on the total weight of the block copolymer.
A hydrogenated alternating pentablock copolymer having three hydrogenated vinyl aromatic polymer blocks, each having a hydrogenation level of greater than 90 percent and two hydrogenated conjugated diene polymer blocks, each having a hydrogenation level of greater than 95 percent, characterized by:
- a) a total number average molecular weight (Mnt) of from 30,000 to 200,000, wherein each hydrogenated vinyl aromatic polymer block has a Mna of from 10,000 to 100,000 and each hydrogenated conjugated diene polymer block has a Mnb of from 2,000 to 50,000.
A composition comprising a hydrogenated alternating pentablock copolymer of three hydrogenated vinyl aromatic polymer blocks having a hydrogenation level of greater than 90 percent and two hydrogenated conjugated diene polymer blocks having a hydrogenation level of greater than 95 percent, characterized by:
- a) a total number average molecular weight (Mnt) of from 40,000 to 70,000, wherein each hydrogenated vinyl aromatic polymer block has a Mna of from 8,700 to 21,000 and each hydrogenated conjugated diene polymer block has a Mnb of from 2,000 to 12,500;
- the total amount of hydrogenated conjugated diene polymer being from 10 to 35 weight percent of the copolymer based on the combined weights of all blocks.
Dependencies are inferred from the claim text.