Block copolymer blends with improved oil absorption resistance

Patent · Tue Nov 14 04:00:00 EST 1989

OSTI ID:7180059

Himes, G R; Sanders, A

This patent describes a thermoplastic blend. It comprises: about 80 to about 20 parts by weight of an elastometric block copolymer having the general configuration A-B-A, wherein: each A block is a polymerized monoalkenyl aromatic hydrocarbon block having an average molecular weight of about 4000 to about 115,000; the A blocks, in combination, comprise about 5 to about 35w% of the elastomeric block copolymer; and each B block is a non-hydrogenated butadiene hydrocarbon block consisting of 8 to 55 mole percent condensed butadiene units in the 1,2 configuration, or a hydrogenated butadiene hydrocarbon block consisting of 35 to 55 mole percent condensed butadiene units in the 1,2 configuration, and the B block has an average molecular weight of between about 20,000 and about 450,000; and about 20 to about 80 parts by weight of a block copolymer having the general configuration A-B-A wherein: each A block is a polymerized monoalkenyl aromatic hydrocarbon block having an average molecular weight of about 4000 to about 115,000; the A blocks, in combination, comprise about 5 to about 35 w % of the block copolymer; each B block is a polymerized butadiene hydrocarbon block consisting of about 18 to 34 mole percent condensed butadiene units in the 1,2 configuration, and the B block has an average molecular weight of between about 20,000 and about 450,000; and the B blocks are hydrogenated to an unsaturation that is less than about 5% of the original unsaturation.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): A; US 4880878
• Application Number: PPN: US 7-138780A
• OSTI ID: 7180059
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
023000* -- Petroleum-- Properties & Composition
AROMATICS
BUTADIENE
CHEMICAL COMPOSITION
COPOLYMERS
DIENES
HYDROCARBONS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYENES
POLYMERS
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHETIC MATERIALS
THERMOPLASTICS