Composition for producing polyurethane foam, in particular rigid polyurethane foam, comprising at least an isocyanate component, a polyol component, optionally a catalyst that catalyses the formation of a urethane or isocyanate linkage, blowing agents, wherein the composition comprises polyester-polysiloxane block copolymers.

The invention relates to the technical field of polymer materials, in particular to a preparation method of polyorganosiloxane-polycarbonate and its application. The preparation method includes the following steps: A: The preparation of polycarbonate terminated by acyl chloride. B: Preparation of polyorganosiloxane-polycarbonate. In the invention, the polyorganosiloxane-polycarbonate has excellent mechanical properties due to the introduction of polydimethylsiloxane terminated by eugenol in the main chain. In particular, the polysiloxane-polycarbonate has high low temperature impact strength, low ductility/brittleness transition temperature and good flame retardancy. In the invention, the polycarbonate modified by the Polyorganosiloxane-polycarbonate has good flexural strength, tensile strength and flame retardancy.

A composition includes specific amounts of a copolycarbonate and a roughening agent. The copolycarbonate contains first carbonate units derived from a first bisphenol monomer such that a homopolycarbonate of the first bisphenol monomer has a glass transition temperature less than 155? C., and second carbonate units derived from a second bisphenol monomer such that a homopolycarbonate of the second bisphenol monomer has a glass transition temperature of 155? C. or higher. The roughening agent includes a particulate crosslinked polymethylsilsesquioxane having a median equivalent spherical diameter greater than 5 micrometers and less than or equal to 10 micrometers.

A method of making an infrared-reflecting optically transparent assembly comprises: coating a curable composition onto a major surface of an optically transparent thermoplastic polymer film; at least partially curing the curable composition, which may be optionally at least partially dried, to provide a thermoformable composite film; and laminating the thermoformable composite film to an infrared-reflecting multilayer optical film to provide the infrared-reflecting optically transparent assembly. The curable composition comprises urethane (meth)acrylate compound, (meth)acrylate monomer, and silicone (meth)acrylate. The infrared-reflecting optically transparent assembly and methods of including it in an infrared-reflecting lens assembly are also disclosed.

A composition includes specific amounts of a copolycarbonate and a roughening agent. The copolycarbonate contains first carbonate units derived from a first bisphenol monomer such that a homopolycarbonate of the first bisphenol monomer has a glass transition temperature less than 155? C., and second carbonate units derived from a second bisphenol monomer such that a homopolycarbonate of the second bisphenol monomer has a glass transition temperature of 155? C. or higher. The roughening agent includes a particulate crosslinked polymethylsilsesquioxane having a median equivalent spherical diameter greater than 5 micrometers and less than or equal to 10 micrometers.

A silicone rubber composition comprises: (A) an organopolysiloxane having at least two alkenyl groups in a molecule and free of an aryl group; (B) (B-1) an organosiloxane having in a molecule at least one aryl group, at least one silicon-bonded hydrogen atom, and free of an alkenyl group, or a mixture of components (B-1) and (B-2) an organosiloxane having in a molecule at least one aryl group and at least one alkenyl group; (C) an acrylic compound or a methacrylic compound; (D) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule and free of an aryl group and an alkenyl group; and (E) a hydrosilylation reaction catalyst. The silicone rubber composition exhibits excellent adhesive properties with respect to diverse organic resins it comes into contact with during its cure, and at the same time possesses excellent mold-release properties with respect to metal dies used for its molding.

The present invention is a stretchable film including: a silicone main-chain type urethane layer and a silicone-pendant type urethane layer, wherein the silicone main-chain type urethane layer has a structure shown by the following general formula (1)-1 and/or (1)-2 and is formed on the silicone-pendant type urethane layer, and the silicone-pendant type urethane layer has a structure shown by the following general formula (2)-1 and/or (2)-2. The present invention provides a stretchable film having excellent stretchability and strength, with the film surface having excellent water repellency, together with a method for forming the same.

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Polymer compositions containing a polyamide polymer and a high molecular weight organopolysiloxane copolymer containing amide, urethane, urea, or thiourea groups exhibit high tensile strength but are soft elastomeric thermoplastics.

A composition includes (a) a methacrylate copolymer including repeating units derived from a Ci-io alkyl methacrylate; maleic anhydride, fumaric anhydride, maleimide, or a combination thereof; and a substituted or unsubstituted alkenyl aromatic monomer; or (b) a combination of a poly(methyl methacrylate) homopolymer and a copolymer comprising repeating units derived from maleic anhydride and an alkenyl aromatic monomer. The composition further includes a poly(carbonate-siloxane) having a siloxane content of 30 to 70 weight percent, based on the total weight of the poly(carbonate-siloxane). Methods of making the compositions and articles made therefrom are also described.

Disclosed herein are surface-modified membranes and other surface-modified substrates exhibiting switchable oleophobicity and oleophilicity in aqueous media. These membranes and substrates may be used for variety of applications, including controllable oil/water separation processes, oil spill cleanup, and oil/water purification. Also provided are the making and processing of such surface-modified membranes and other surface-modified substrates.