An aqueous polyurethane dispersion includes particles of polyurethane in water, wherein the polyurethane is derived from an organic diisocyanate, a hydrophilic monomer, a neutralizer, a chain extender, and a polyester resin, the polyester resin being a random copolymer having randomly distributed subunits of formula 1: ##STR00001##
where: R is ethylene, octylene, or decylene, a is from about 40 to about 100 mole % of the polyester resin, b is from 0 to about 30 mole % of the polyester resin, c is from 0 to about 30 mole % of the polyester resin, and a+b+c=100 mole % of the polyester resin.

The present invention relates to biodegradable copolyesters with molecular weight Mn from 10 000 to 100 000 measured by GPC, obtainable via reaction of i) from 51 to 84% by weight, based on the copolyester, of a branched polyester middle block produced from aliphatic or aliphatic and aromatic dicarboxylic acids and from aliphatic dihydroxy compounds with molecular weight Mn from 5000 to 25 000 measured by .sup.1H NMR with from 15.9 to 48.9% by weight, based on the copolyester, of a lactide in the presence of a catalyst, and then the resultant polyester triblock with molecular weight Mn measured by .sup.1H NMR from 5800 to 49 500 with ii) from 0.1 to 3% by weight, based on the copolyester, of a diisocyanate.

The present invention further relates to a process for the production of, and to the use of, the abovementioned biodegradable copolyesters.

The present disclosure provides a crosslinking agent, the preparation process and uses thereof, a hydrogel and a biodegradable cryogel including the crosslinking agent.

The present invention relates to a composition comprising 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate and more than 50 to 90 wt.-% of at least one polyisocyanate a-2) based on isophorone diisocyanate, comprising monomeric isophorone diisocyanate and at least one oligomeric isophorone diisocyanate, and an isocyanate-reactive component selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof. It has been shown that the above mentioned mixture of the specific isocyanate group containing components improves the thermal and mechanical properties of a cured composition. Thus prepared molded articles are particularly suitable for the preparation of spectacle lenses, inter alia due to these properties.

The present invention relates to a polymer composition comprising a polymeric matrix and particles of an impact modifier within the polymeric matrix, wherein the impact modifier comprises at least one urethane group and the impact modifier is obtainable by reacting in situ within the polymeric matrix a) a polyol comprising a dimer fatty residue; and b) a polyisocyanate. The invention also relates to a method of making the polymer composition.

A composition comprised of a component selected from the group consisting of a biobased bis-alkyl succinate and a biobased bis-alkyl sebacate, each derived, for example, from the esterification of biobased diacid such as succinic acid or sebacic acid, and a biobased alcohol and a biobased polyester.

The present disclosure provides a crosslinking agent, the preparation process and uses thereof, a hydrogel and a biodegradable cryogel including the crosslinking agent.

A composition comprised of a component selected from the group consisting of a biobased bis-alkyl succinate and a biobased bis-alkyl sebacate, each derived, for example, from the esterification of biobased diacid such as succinic acid or sebacic acid, and a biobased alcohol and a biobased polyester.

The present invention provides alternative polyurethane composition comprising the reaction product of an azidated polyol and a poly(alkynyl carbamate) prepolymer, wherein the poly(alkynyl carbamate) prepolymer comprises the reaction product of a polyisocyanate, an alkynol, and an oxysilane. The reaction of the polyol and the prepolymer may occur in the presence of a catalyst or at a temperature of from 20° C. to 120° C. The inventive oxysilane and azido-alkyne hybrid click formulations provide comparable performance, and in some cases better performance, to/than urethane and azido-alkyne control click formulations in terms of pencil hardness, MEK double rubs, and glass transition temperature. The inventive alternative polyurethane compositions may be used to provide coatings, adhesives, sealants, films, elastomers, castings, and composites.

Use of phase segregated block-copolymer based on repeating structural elements represented by formula I

##STR00001##

wherein PHA represents at least one block based on one or more a-hydroxy acids, PDAS represents a central block based on a dialkylsiloxane, the PDAS block has a weight average molecular weight in the range of from 4000 to 10000, the blocks PHA have a weight average molecular weight in the range of from 2000 to 10 000, the phase segregated block copolymer has a weight average molecular weight of from 40 000 to 120 000 and wherein R is a divalent organic residue for the coating of substrates and coated substrates.