Lactide-based random polyester polyols for use in polyurethane compositions are disclosed. The polyester polyols have an OH value in the range of greater than 400 mg KOH/g up to 1100 mg KOH/g and are the reaction product of at least one polycarboxylic acid, at least one lactide, and one or more polyalcohols. The polyester polyols can be formulated into the B-side of a two part polyurethane composition to obtain a polyurethane having improved hardness and solvent resistance and a low VOC content. The polyurethane composition is particularly suitable for polyurethane coating applications.

The invention relates a novel polyglycolic acid. The polyglycolic acid comprises branched repeating units and linear repeating units. The polyglycolic acid may be produced from methyl glycolate by polycondensation in the presence of structure regulators, and exhibit excellent melt strength and thermal stability while maintaining good flowability and suitability for use in melt blow molding.

Described herein is a feasible, significantly simplified production method that avoids challenging lactonization steps and converts a low molecular weight aliphatic polyester, consisting of hydroxy acids and a comonomer, whose molecular weight has been increased by step-growth polymerization reactions. The molecular weight of the aliphatic polyester, based on comparison of initial and final weight average molecular weights (M.sub.w,1/M.sub.w,2), increased significantly at a rate which permits the use of reactive extrusion to produce high molecular weight aliphatic polyesters in a simple, economically feasible manner.

A method for producing a hydroxy fatty acid condensate or a mixture of hydroxy fatty acid condensates is provided. The method involves the steps of providing one or more fatty acids having at least one C═C double bond functionality, biotechnologically adding H.sub.2O to at least one C═C double bond functionality of the one or more fatty acids and thus obtaining one or more hydroxy fatty acids, and reacting the one or more hydroxy fatty acids with one or more at least divalent linker groups, thus obtaining a hydroxy fatty acid condensate or a mixture of hydroxy fatty acid condensates. Also provided are a hydroxy fatty acid condensate or a mixture of hydroxy fatty acid condensates obtained by the method, as well as polyurethane, obtained by reacting such a hydroxy fatty acid condensate or mixture of hydroxy fatty acid condensates.

Among other things, the present disclosure provides compositions and methods for an elastomeric cross-linked polyester material. Such an elastomeric cross-linked polyester material, in some embodiments, comprises a plurality of polymeric units of the general formula (-A-B-).sub.p, wherein p is an integer greater than 1; and a plurality of urethane cross-links each of which covalently links two polymeric units to one another, which two linked polymeric unit each had at least one free hydroxyl or amino group prior to formation of the crosslink.

A crosslinkable composition is useful for preparing a skin contact adhesive or a coating on a substrate. The crosslinkable composition includes (A) a polyurethane-polyorganosiloxane copolymer and (B) a curing catalyst. The skin contact adhesive prepared by crosslinking the crosslinkable composition is useful in applications such as adhesives for medical tapes, adhesives for wound dressings, adhesives for prosthetics, ostomy appliance adhesives, adhesives for medical monitoring appliances, adhesives for scar therapy treatments, adhesives for cosmetic patches, and transdermal drug delivery systems.

Among other things, the present disclosure provides compositions and methods for an elastomeric cross-linked polyester material. Such an elastomeric cross-linked polyester material, in some embodiments, comprises a plurality of polymeric units of the general formula (-A-B-).sub.p, wherein p is an integer greater than 1; and a plurality of urethane cross-links each of which covalently links two polymeric units to one another, which two linked polymeric unit each had at least one free hydroxyl or amino group prior to formation of the crosslink.

A polyurethane-polyorganosiloxane copolymer is useful as a film forming agent in personal care compositions, such as hair care compositions and skin care compositions.

A silicone urethane urea copolymer and methods for preparation and use of the copolymer are disclosed. The copolymer is crosslinkable. The copolymer is useful in various applications, including personal care compositions, such as hair care compositions and skin care compositions and in health care compositions such as skin contact adhesive compositions and transdermal drug delivery systems.

A polymer composition includes: a first proportion of an aliphatic-diisocyanate terminated polyol; a second proportion of an aromatic diisocyanate; a third proportion of an aromatic diamine curative configured to extend a chain length of the aliphatic-diisocyanate-terminated polyol and the aromatic diisocyanate; a fourth proportion of a polyester polyol configured to polymerize with the aliphatic-diisocyanate-terminated polyol; and a fifth proportion of a high functionality dendrimer configured to crosslink polymer chains of the aliphatic-diisocyanate-terminated polyol. Further, the hybrid copolymer can be configured to form a protective film layer in a foldable electronic display, the foldable electronic display including: a cover layer arranged over the protective film layer; and an array of organic light-emitting diodes arranged beneath the protective film layer.