Provided is a urethane (meth)acrylate that can be cured to form a cured product excellent in stretchability, flexibility, and foldability, as well as shape recoverability when folded. The urethane (meth)acrylate of the present invention is represented by the following formula (1) and has a number average molecular weight (Mn) of 16000 to 60000, a ratio of a weight average molecular weight (Mw) to the (Mn), Mw/Mn, of 1.0 to 1.2, and a urethane group mass content of 0.18 to 0.73 mass % based on a total mass of the urethane (meth)acrylate:

R.sup.2NHC(?O)OR.sup.1OC(?O)NHR.sup.3(1) wherein R.sup.1 is a residual group formed by removing two hydroxy groups from a molecule of a diol selected from the group consisting of a polyether diol, a polyester diol, and a polycarbonate diol; and R.sup.2 and R.sup.3 are each independently a residual group formed by removing an isocyanate group from a monoisocyanate having one or more (meth)acryloyloxy groups per molecule.

Provided is a urethane (meth)acrylate that has a viscosity excellent in handling and can be cured to form a cured product having a large tensile strength and being excellent in toughness and shape recoverability when folded as well as shape retention. The urethane (meth)acrylate of the present invention is represented by the following formula (1) and having a number average molecular weight (Mn) of 7500 to 60000:

##STR00001## wherein R.sup.1 is an n-valent residual group formed by removing a hydroxy group from a polyol having a number n of hydroxy groups per molecule, the polyol is selected from the group consisting of a polyether polyol, a polyester polyol, and a polycarbonate polyol; and n is 3 or more; and a number n of R.sup.2 per molecule are each independently a residual group formed by removing an isocyanate group from a monoisocyanate having one or more (meth)acryloyloxy groups per molecule.

The invention relates to a polyurethane bone-tendon graft biomaterial and method of making the bone-tendon graft biomaterial. The biomaterial has a gradient of mechanical properties through photocrosslinking such that a first end of the biomaterial is crosslinked at a higher degree than a second end, and the first end of the biomaterial has mechanical properties of bone and the second end of the biomaterial has mechanical properties of tendon.

Urethane-urea-acrylic cast sheet materials are made from a reaction product of components including polyisocyanate compound having at least two isocyanate functional groups and optional polyol (or pre-reacted urethane prepolymer having at least two isocyanate functional groups), curative having at least two amine functional groups, acrylic monomer, and optional multifunctional monomer having a first functional group having an active hydrogen and a second functional group having at least one double bond. The urethane-urea-acrylic cast sheet materials exhibit excellent impact properties and desirable hardness while also maintaining optical properties such as low haze that can be comparable to that of conventional cast acrylic sheet.

A process for producing an object from a precursor comprises the steps of: depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply; repeating step II) until the precursor is formed; wherein the depositing of a free-radically crosslinked resin at least in step II) is effected by exposure and/or irradiation of a selected region of a free-radically crosslinkable resin corresponding to the respectively selected cross section of the object and wherein the free-radically crosslinkable resin has a viscosity (23 C., DIN EN ISO 2884-1) of 5 mPas to 100000 mPas. In the process the free-radically crosslinkable resin comprises a curable component in which NCO groups and olefinic CC double bonds are present, wherein in the curable component the molar ratio of NCO groups to olefinic CC double bonds is in a range from 1:5 to 5:1.

The present invention relates to a one-pot process for the production of poly carbodiimide cured polymers. comprising a reaction of (a) at least one polycarbodiimide with two or more carbodiimide functionalities per molecule. (b) at least one polyol with two or more hydroxyl functionalities per molecule, and (c) at least one cyclic carboxylic anhydride.

A laminating adhesive with improved digital ink lamination properties comprising an isocyanate component and a polyol component. The isocyanate component comprises an isocyanate prepolymer and an aliphatic polyisocyanate. The polyol component comprises a transesterified polyester polyol made from an aromatic polyester polyol and a natural oil. polypropylene glycols. and a phosphate adhesion promotor. The isocyanate prepolymer within the isocyanate component comprises the reacted product of an isocyanate with a polyalkylene glycol polymer. Laminating structures can be made by coating at least part of a substrate with the adhesive and contacting the first substrate with a second.

A composition comprises an NCO component and an OH component. The NCO component comprises at least one polyurethane having at least two NCO end groups and optionally a polyisocyanate compound comprising at least one polyisocyanate P comprising at least three isocyanate functions NCO. The OH component comprises a polybutadiene polyol P1 comprising at least two hydroxyl functions, said polyol P1 having a number-average molecular weight ranging from 1000 g/mol to 15 000 g/mol; a polyol P2 chosen from diols, triols, or mixtures thereof, a polyol P3 having a hydroxyl functionality of greater than or equal to 2, said polyol P3 being chosen from the group consisting of polyether polyols, polyols of natural origin, polyester polyols, and mixtures thereof, and at least one filler, the total content of filler(s) being greater than or equal to 30% by weight relative to the total weight of said OH component.

The present invention relates to a polymer having formula (I):

##STR00001##

wherein the line - - - represents a covalent bond, or a linkage group selected from: NRC(O)O, C(O)OC(O)NR, C(O)NR, NHC(O)NH, wherein R is H, optionally substituted C1-C6 alkyl, C1-C6 heteroalkyl, carbocycle, aryl, or heteroaryl; P is a polymer comprising y number of peripheral functional groups; L is a linker moiety selected from optionally substituted, aliphatic, branched or cyclic alkyl, aryl, phenyl, or alkylene diphenyl; A is a hydrophobic functional group; B is a hydrophilic functional group, and carboxylate; and X is a cross-linkable functional group; each of m, n and q are greater than zero, and wherein m+n+qy, and use of the polymer for preparing coating compositions.

The present invention provides an ultraviolet curable composition including: an urethane resin having a polymerizable unsaturated group, which is obtained by reacting a polyol and a polyisocyanate with each other, wherein the polyol contains an alkylene diol having two or more polymerizable unsaturated groups, which is represented by general formula (1), or an oxyalkylene diol having two or more polymerizable unsaturated groups, which is represented by general formula (2); an aqueous medium; and a photopolymerization initiator having an absorption peak at a wavelength in the range of from 320 to 460 nm. The ultraviolet curable composition is satisfactorily cured even when using an LED lamp as a light source, and can form a cured coating film having both elongation and surface hardness.

HOR.sup.1OH(1)

HOR.sup.1OR.sup.2OR.sup.3OH(2)