The present invention provides: a photochromic curable composition which contains (A) a (meth)acrylate composition that contains from 24 to 100% by mass of a polyfunctional (meth)acrylate which has three or more (meth)acryloyl groups in each molecule and (B) a photochromic compound that is obtained by bonding at least one specific naphthopyran to a long-chain group having a number average molecular weight of from 300 to 10,000; and a photochromic optical article which is obtained by polymerizing this photochromic curable composition.

The present invention provides: a photochromic curable composition which contains (A) a (meth)acrylate composition that contains from 24 to 100% by mass of a polyfunctional (meth)acrylate which has three or more (meth)acryloyl groups in each molecule and (B) a photochromic compound that is obtained by bonding at least one specific naphthopyran to a long-chain group having a number average molecular weight of from 300 to 10,000; and a photochromic optical article which is obtained by polymerizing this photochromic curable composition.

The invention relates to a multifunctional acrylic product having a number-average functionality f of acrylate groups greater than 2.1, which is the product of reaction by esterification and by etherification, via Michael addition reaction, between a) a polyol or a mixture of polyols R(OH).sub.m having a functionality m of at least 3 for a polyol alone or having an average functionality greater than 2.1 for a mixture of polyols, and b) the acrylic acid (R.sub.1OH) in the presence of c) at least one cyclic polycarboxylic anhydride or of its polyacid form having a carboxy functionality z of at least 2 and up to 4, the ratio r.sub.1 of number of carboxy groups of said anhydride or polyacid c) with respect to those of the acrylic acid b) r.sub.1=CO.sub.2Hc/CO.sub.2Hb being from 0.01 to 0.4 with overall r=CO.sub.2H/OH<1, said acrylic product comprising in its composition both: units A) of oligoether-ester acrylate that are derived from a) and b) and units B) of oligoester acrylate that are derived from c),
said acrylic product being a mixture of acrylic products comprising at least one acrylic product p1 chemically linking, in its molecular structure, the two types of units A) and B) as defined above.

The invention also relates to a process for preparing said product, to crosslinkable compositions comprising same and to the use thereof in coatings, sealing, moulding or composite compositions, chemical sealing compositions, 3D printing compositions or compositions for 3D objects produced layer-by-layer. One particular advantage of these compositions is their low shrinkage despite their high functionality.

Pre-polymers for use as tissue sealants and adhesives, and methods of making and using thereof are provided. The pre-polymers have flow characteristics such that they can be applied through a syringe or catheter but are sufficiently viscous to remain in place at the site of application and not run off the tissue. The pre-polymers are also sufficiently hydrophobic to resist washout by bodily fluids. The pre-polymers are stable in bodily fluids; that is the pre-polymer does not spontaneously crosslink in bodily fluids absent the presence of an intentionally applied stimulus to initiate crosslinking. Upon crosslinking, the adhesive exhibits significant adhesive strength in the presence of blood and other bodily fluids. The adhesive is sufficiently elastic that it is able to resist movement of the underlying tissue. The adhesive can provide a hemostatic seal. The adhesive is biodegradable and biocompatible, causing minimal inflammatory response.

The invention describes a core shell microcapsule wherein the capsule shell is hydrolysable. The capsule is made from a water phase with initiator and emulsifier, and from one or more oil phases having a first multifunctional (meth)acrylate monomer having greater than one ester group on average in the monomer and having a hydrophilicity index of less than 20; a second multifunctional (meth)acrylate monomer, the second multifunctional (meth)acrylate comprising a hydrophilic multifunctional polar monomer having a hydrophilicity index of at least 20 and said second multifunctional polar monomer comprising 50% or less of the capsule shell along with an acidic (meth)acrylate monomer or at least one oil soluble or dispersible simple acid, the acidic (meth)acrylate monomer having one or more groups which are selected from carboxy and sulfonic groups, and optionally from 0 to 50% by weight of the shell comprises in addition an aliphatic polyester comprising an oligomer, polymer or co-polymer of one or more of lactic acid, caprolactone, or glycolic acid, the aliphatic polyester having two or more of acrylate or methacrylate groups.

The invention describes a core shell microcapsule wherein the capsule shell is hydrolysable. The capsule is made from a water phase with initiator and emulsifier, and from one or more oil phases having a first multifunctional (meth)acrylate monomer having greater than one ester group on average in the monomer and having a hydrophilicity index of less than 20; a second multifunctional (meth)acrylate monomer, the second multifunctional (meth)acrylate comprising a hydrophilic multifunctional polar monomer having a hydrophilicity index of at least 20 and said second multifunctional polar monomer comprising 50% or less of the capsule shell along with an acidic (meth)acrylate monomer or at least one oil soluble or dispersible simple acid, the acidic (meth)acrylate monomer having one or more groups which are selected from carboxy and sulfonic groups, and optionally from 0 to 50% by weight of the shell comprises in addition an aliphatic polyester comprising an oligomer, polymer or co-polymer of one or more of lactic acid, caprolactone, or glycolic acid, the aliphatic polyester having two or more of acrylate or methacrylate groups.

The present invention provides energy curable ink and coating compositions that comprise polymerizable compounds, photoinitiators, and colorants. The polymerizable compounds comprise one or more polymerizable monomers and/or oligomers, wherein at least a portion is 3-methyl-1,5-pentanediol diacrylate. The inks and coatings of the invention exhibit excellent print properties after UV-LED, standard UV mercury vapor lamp, and electron beam cure.

The present invention provides energy curable ink and coating compositions that comprise polymerizable compounds, photoinitiators, and colorants. The polymerizable compounds comprise one or more polymerizable monomers and/or oligomers, wherein at least a portion is 3-methyl-1,5-pentanediol diacrylate. The inks and coatings of the invention exhibit excellent print properties after UV-LED, standard UV mercury vapor lamp, and electron beam cure.

Binder compositions and methods for making and using same are provided. In at least one specific embodiment, the binder composition can include at least one unsaturated compound having two or more unsaturated carbon-carbon bonds and at least one free radical precursor. At least one of the unsaturated carbon-carbon bonds can be a pi-bond that is not conjugated with an aromatic moiety and can be capable of free radical addition. The free radical precursor can be present in an amount of about 7 wt % to about 99 wt %, based on the weight of the one or more unsaturated compounds.

The present invention provides a resin composition suitable for producing a diffractive optical element, the resin composition including an indium tin oxide particle and a near-ultraviolet light-absorbing organic compound having a maximum value of an absorbance at 340 nm to 400 nm in an absorption spectrum in a wavelength region of 300 nm to 780 nm and exhibiting substantially no light absorption at a wavelength of 410 to 800 nm.