Polymer blends having high impact resistance after mechanical working are produced by blending together a non-elastomeric monovinylidene aromatic polymer such as polystyrene with an elastomeric copolymer, such as a block copolymer of styrene and butadiene, in the form of crosslinked, colloidal size particles.

Methods and fluids are provided that include, but are not limited to, a drilling fluid comprising an aqueous base fluid and a fluid loss control additive that comprises at least one polymeric micro gel and a method comprising: providing an aqueous based treatment fluid comprising a fluid loss control additive that comprises at least one polymeric micro gel; placing the aqueous based treatment fluid in a subterranean formation via a well bore penetrating the subterranean formation; allowing the fluid loss control additive to become incorporated into a filter cake located on a surface within the subterranean formation; allowing the filter cake to be degraded; and producing hydrocarbons from the formation. Additional methods are also provided.

Cross-linked block copolymer blends with improved impact resistance

Methods of using fluid loss additives comprising micro gels

Shaped articles which are resistant to attack by fatty substances and chemicals and which have impact resistance comparable to high impact polystyrene are produced by extrusion or injection molding of a composition consisting essentially of high impact styrene-butadiene graft copolymer or a mixture thereof with no more than about 55% styrene homopolymer and small proportions of polyethylene or polypropylene and of a block copolymer X-Y-X in which each X is a polystyrene block of about 5,000 to 10,000 molecular weight and Y is a hydrogenated polybutadiene block of 25,000 to 50,000 molecular weight. The articles are characterized by having a skin which is substantially enriched in polyolefin.

Articles resistant to attack by fatty substances, made from polystyrene blends, and compositions

Residual volatiles in styrene polymers can be reduced by combining a minor amount of a styrene-conjugated diene block copolymer with the styrene polymer.

Cross-linked block copolymer blends with improved impact resistance

Citations

Methods of using fluid loss additives comprising micro gels

Articles resistant to attack by fatty substances, made from polystyrene blends, and compositions

Reduction of residual volatiles in styrene polymers

References

Radiation crosslinked block copolymer blends with improved impact resistance

Preparation of vulcanizates by irradiation of block copolymers

Peroxide treatment of high inpact resin compositions containing styrene-acrylonitrile copolymers

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