Back to results
US 4,397,988 AGranted
Blends of p-methylstyrene polymer and diene-styrene or diene-(p-methylstyrene) block copolymers
AssigneeMobil Oil Corporation
InventorAnthony M. Sherman
Life of this patent
Estimating the term…
Abstract
Blends of conjugated diene-styrene or diene-(p-methylstyrene) block copolymers and polymers of p-methylstyrene. The blends exhibit excellent physical and optical properties.
Claims18
A polymer blend comprising
- A. 10 to 90 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer;
- and
- B. 90 to 10 parts by weight of a block copolymer of a conjugated diene and either styrene or methyl styrene, but not both, which block copolymer is selected from the group consisting of
- a block copolymer of greater than 40 to 60 weight % of a conjugated diene and from 40 to less than 60 weight % styrene;
- a block copolymer of 10 to less than 20 weight % of a conjugated diene and from greater than 80 to 90 weight % styrene;
- and
- a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % methylstyrene isomers having a para content of at least 90%.
4 more elements
A polymer blend comprising
- A. 10 to less than 40 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer;
- and
- B. 90 to greater than 60 parts by weight of a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % of either styrene or methylstyrene isomers, but not both, in which said methyl styrene isomers have a para content of at least 90%.
A polymer blend comprising
- A. greater than 70 to 90 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer;
- and
- B. less than 30 to 10 parts by weight of a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % of either styrene or methylstyrene isomers, but not both, in which said methyl styrene isomers have a para content of at least 90%.
Dependencies are inferred from the claim text.