A polyester is formed by reacting a plurality of monomers. The monomers include 7 to 20 parts by mole of (a) aliphatic triol monomer, 40 to 80 parts by mole of (b) first diol monomer, 12 to 40 parts by mole of (c) second diol monomer, and 100 parts by mole of (d) aliphatic diacid monomer or aliphatic anhydride monomer. The (b) first diol monomer has a chemical structure of

##STR00001##

wherein each R.sup.1 is the same. The (c) second diol monomer has a chemical structure of

##STR00002##

wherein R.sup.6 is different from R.sup.7.

The present invention discloses a silicone rubber and a method for preparing it, and a phenolic modified silicone rubber resin and a method for preparing it. The structural formula of the silicone rubber is shown as follows: ##STR00001## Wherein x=70-80, y=10-20. The structural formula of the phenolic-modified silicone rubber resin is shown as follows: ##STR00002## wherein n, x, y are degrees of polymerization, n=10-20, x=70-80, y=10-20. A method for preparing the phenolic-modified silicone rubber resin orderly comprises: adding 90-110 parts by mass of brominated phenolic resin and 180-220 parts of organic solvent into 100 parts by mass of silicone rubber, reacting at 70-80° C. for 24-48 h until the solution is clear and transparent; adding 9-11 parts by mass of capping agent, reacting for another 4-5 h to obtain a reaction liquid containing phenolic-modified silicone rubber resin. The phenolic-modified silicone rubber resin prepared in the present invention can solve the problem of easy pulverization in the ablation process of conventional silicone rubber and meanwhile has high mechanical properties.

A polyamic acid useful for forming a protective or insulative layer for semiconductor elements has a structure represented by chemical formula (1): ##STR00001##
wherein δ represents an oxygen or sulfur atom; W represents an electron-withdrawing group; and R.sup.11 and R.sup.12 represent independently a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms.

A moisture-curing composition including a) at least one moisture-reactive polymer P with a proportion of 10% to 60% by weight, based on overall composition, b) at least one inorganic filler F with a proportion of at least 9% by weight, based on overall composition, c) between 3% and 25% by weight, based on overall composition, of at least one type of microscopic hollow beads H, wherein composition has density of less than 1.20 kg/l, and microscopic hollow beads H have compressive strength, measured to ASTM D3102-72, of at least 2.5 MPa, and microscopic hollow beads H have a volume-based particle size D90, measured by Coulter counter, of less than 100 μm.

A high-temperature-stable spin-on-carbon (“SOC”) material that fills topography features on a substrate while planarizing the surface in a one-step, thin layer coating process is provided. The material comprises low molecular weight polyimides or diimides that are pre-imidized in solution rather than on the wafer. The SOC layers can survive harsh CVD conditions and are also SC1 resistant, especially on TiN and SiOx surfaces.

A polyarylene ether comprising in polymerized form A) at least one tri- or higher functional compound and B) isosorbide, isomannide, isoidide or a mixture thereof, wherein the polyarylene ether is a polyarylene ether sulfone or a polyarylene ether ketone, a process for its preparation and its use in the preparation of a coating, film, fiber, foam, membrane or molded article.

A process for preparing a polyurethane product, and polyurethane compositions and products of the process. The process includes preparing a catalyst composition comprising at least one tertiary amine salt, wherein the at least one tertiary amine salt is a contact product of at least one carboxylic acid and at least one tertiary amine, wherein the at least one tertiary amine is selected from the group consisting of N-hydroxyethylpiperidine and tris(dimethylaminomethyl)phenol; and reacting at least one isocyanate, at least one polyol and the catalyst composition to form a polyurethane product.

Medical articles formed from a polyurethane-based resin including an ionically-charged modifier provide enhanced properties. The polyurethane-based resin is a reaction product of ingredients comprising: a diisocyanate; a diol chain extender; a polyglycol; and an ionically-charged modifier incorporated into a backbone, as a side chain, or both of the polyurethane-based resin. Embodiments include the ionically-charged modifier is a combination of anionic and cationic modifiers. Embodiments include the ionically-charged modifier is zwitterionic. Medical articles herein either have inherent antimicrobial and/or anti-fouling characteristics or can easily bond ionic active agents to provide desirable material properties, including antimicrobial, anti-fouling, and/or radiopacity.

Coating compositions comprising a compound having at least two cyclic carbonate groups and a siloxane group (called “carbonate compound”).

The invention relates to a composition and to a process for preparing moisture-crosslinking polymers under catalysis by at least one metal-siloxane-silanol(ate) compound, and to the use of the composition in the CASE sector (coatings, adhesives, sealants and elastomers), especially in the field of adhesives and sealants.