Novel methods for producing porous silicone compositions are disclosed. Methods of this invention provide improved processes for preparing porous silicone rubbers having low specific gravity and mainly closed cells which are suitable for highly permeable gas penetration while adequately sealing liquid material. Examples of these sealing materials include but are not limited to encapsulants for bioindicators and syringe sealing components wherein the permeability is sufficient to permit sterilization while preventing passage or leaking of liquids to be sterilized through the described silicone materials.

The present invention relates to a crosslinkable composition for forming a polyurethane coating on different types of substrate. The present invention relates in particular to a polyurethane composition comprising isosorbide as a diol chain extender, and to the polyurethane coating obtained from this composition.

A method of preparing a polycarbonate composition, including: melt polymerizing in a polymerization unit a dihydroxy compound with a diaryl carbonate and removing a stream of color inducing species containing an isopropenyl phenyl-containing group from the polymerization unit, to form a polycarbonate composition, wherein the polycarbonate has a color inducing species containing an isopropenyl phenyl-containing group level below 170 ppm is provided.

Silicone polyurea block copolymers are prepared by copolymerizing: (a) a diamine composition that includes a polyethylene glycol diamine, and optionally, a dipiperidyl alkane; (b) a monofunctional silicone isocyanate; and (c) a diisocyanate. Compositions useful as passivating coatings comprising the block copolymer are also provided, and substrates coated with the compositions. Methods of preparing and using the compositions are also described.

A multi-component crosslinkable composition includes at least one component (K1) and one component (K2). Component (K1) contains organosilicon compounds (A1) selected from compounds (A1a) of formula (Ia), the formula (Ia) being Y.sup.1—[B.sup.1—CR.sup.2.sub.2—SiR.sub.a(OR.sup.1).sub.3-a].sub.x, and compounds (A1b) of formula (Ib), the formula (Ib) being Y.sup.2—[B.sup.2—(CR.sup.4.sub.2).sub.b—Si(OR.sup.3).sub.3].sub.y. Component (K2), based in each case on 100 parts by weight of compounds (A1) in component (K1), includes at least 0.05 parts by weight of water and 10 to 1000 parts by weight of a component (A2) selected from compounds (A2a) of formula (IIa), the formula (IIa) being Y.sup.3—B.sup.3—CR.sup.7.sub.2—SiR.sup.5.sub.c(OR.sup.6).sub.3-c, and compounds (A2b) of formula (IIb), the formula (IIb) being Y.sup.4—[B.sup.4—(CR.sup.10.sub.2).sub.e—SiR.sup.8.sub.d(OR.sup.9).sub.3-d].sub.z.

A branched organosilicon compound (“compound”) having the general formula (R1).sub.3SiX—NR.sup.2-D-Z(R.sup.7).sub.a is provided. In the formula: each R.sup.1 is selected from R and —OSi(R.sup.4).sub.3, with the proviso that at least one R.sup.1 is —OSi(R.sup.4).sub.3; where each R.sup.4 is selected from R, —OSi(R.sup.5).sub.3, and —[OSiR.sub.2].sub.mOSiR.sub.3; where each R.sup.5 is selected from R, —OSi(R.sup.6).sub.3, and —[OSiR.sub.2].sub.mOSiR.sub.3; where each R.sup.6 is selected from R and —[OSiR.sub.2].sub.mOSiR.sub.3; with the proviso that at least one of R.sup.4, R.sup.5 and R.sup.6 is —[OSiR.sub.2].sub.mOSiR.sub.3; where each R is independently a substituted or unsubstituted hydrocarbyl group; and where 0≤m≤100; each of X and D is an independently selected divalent linking group; each R.sup.2 and R.sup.7 is an independently selected substituted or unsubstituted hydrocarbyl group or H; Z is O or N; and subscript a is the valency of Z. Also provided is a method of preparing the compound and a composition including the compound.

The invention relates to a curable coating composition comprising at least one surface modifying amphiphilic additive and at least one amphiphilic siloxane-polyurethane coating composition. The invention also relates to methods of making and using the curable coating composition of the invention. The invention also relates to methods for reducing or preventing biofouling of a surface exposed to an aqueous environment comprising the use of the curable coating composition of the invention.

Multifunctional resins suitable for use in coating and adhesive compositions derived from bio-based feedstocks are disclosed. The multifunctional resins are derived from a reaction mixture including (A) a polyol resin, (B) at least one compound having at least one of a dibasic carboxylic acid or derivative thereof, an anhydride, a caprolactone, a C═O source, a polyhydric alcohol, or a combination thereof, and (C) a catalyst.

Disclosed herein is a branched polyester formed by an acid component, a diol component and a polyol component. The acid component includes an amino dicarboxylic acid of formula (I)

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where R.sup.1 is hydrogen or a hydrocarbon having 1 to 20 carbon atoms. One or more carbon atoms can be replaced by oxygen, provided that the replaced carbon is not a primary carbon atom and, if more than one oxygen replaces carbon atoms, at least two carbon atoms are between adjacent oxygen atoms. The diol component includes a diol, the polyol component includes a polyol, and the acid component forms carboxylic acid ester groups with the diol and the polyol. The molar ratio of diol and polyol is between 2:1 and 1:2. Further disclosed are a process for preparing the branched polyester, a reaction product of the branched polyester with a polyisocyanate, and a method of using the reaction product.

A two-part moisture cure organosiloxane composition is disclosed. The two-part moisture cure organosiloxane composition comprises a base component and a catalyst package. The catalyst package undergoes minimal phase separation during storage.