Abstract: This disclosure provides low-viscosity resins for producing polymers with properties suitable for use in various mechanical appliances, such as orthodontic appliances (e.g., aligners). The low-viscosity resins may be photo-curable and can be used with direct fabrication methods and equipment. In various embodiments, the polymeric materials produced from the low-viscosity resins described herein have high toughness while remaining resistant to stress relaxation. Low-viscosity, photo-curable resins described herein have reduced hydrogen bonding in comparison to traditional materials (e.g., materials having high urethane content) used in orthodontic appliances.

Abstract: This disclosure provides polymeric materials comprising weak crosslinking covalent bonds and/or weak crosslinking units comprising a weak covalent bond. Weak covalent bonds can be used in place of hydrogen bonds present in traditional polymeric materials (e.g., polyurethanes). Advantageously, the toughness can be controlled by varying the strength of weak covalent bonds and/or by varying the number of weak covalent crosslinks. Crosslinked materials applying the weak covalent crosslinking bonds can be used to create tough materials able to resist stress relaxation. Further, the present disclosure provides polymer chains and polymeric materials comprising inchain loops (also referred to herein as rings). The inchain loops comprise weak bonds and/or weak bridges comprising at least one weak bond.

Abstract: A radiation curable inkjet ink containing at least one or two compounds selected from the group consisting of a polymerizable compound including a vinylether group or a vinylamide group, an amine synergist including an alkanolamine group or a dimethyl benzoate group, and a Norrish Type II photoinitiator including a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, a ketocoumarin group and a camphorquinone group; and a singlet oxygen quencher including at least one specific amino-thioether group.

Abstract: Dental compositions and methods of formulating a dental composition are described. In one embodiment, the dental composition comprises a polymerizable resin comprising one or more ethylenically unsaturated monomers or oligomers and nanoparticles. The nanoparticles have a refractive index of at least 1.600 and an average discrete or aggregate particle size of no greater than 100 nm. The dental composition further comprises inorganic metal oxide filler having a discrete or aggregate average particle size of at least 200 nm. The nanoparticles are present at a concentration to provide a refractive index differential between the cured polymerizable resin and inorganic metal oxide filler such that the contrast ratio of the dental composition is at least 40.

Abstract: The present invention provides a polymer which has a polymerizable functional group but still can be thermoformed without being crosslinked and which undergoes crosslinking upon irradiation with an active energy ray after being formed, and a composition including the polymer. An active energy ray crosslinkable thermoplastic polymer includes specific monomer units (1). The ratio of the number of moles of the monomer units represented by the general formula (1) to the number of moles of all monomer units constituting the polymer is not less than 1 mol %. The number average molecular weight (Mn) of the active energy ray crosslinkable thermoplastic polymer is 20,000 to 500,000.

Abstract: The present disclosure provides a humidity-stiffening polymer material, and a preparation method therefor and a use thereof. The humidity-stiffening polymer material includes the following raw materials: a monomer, an ionic liquid, a salt, a cross-linking agent and an initiator, wherein the monomer includes benzyl methacrylate, the ionic liquid includes an imidazole-based ionic liquid, and the salt includes a hygroscopic salt. The method for preparing the humidity-stiffening polymer material includes: mixing the raw materials to obtain a precursor liquid, performing reaction on the mixture after degassing, and drying the mixture to obtain the humidity-stiffening polymer material. The humidity-stiffening polymer material is applied to actuators, soft robots and wearable biomedical devices based on bionic design.

Abstract: Described in preferred embodiments are UV curable coating compositions including a unique blend of aliphatic urethane acrylate resins. Also described are coated articles and methods for their production involving the use of the coating compositions.

Abstract: A curable resin composition for producing a three-dimensional object formed of a cured resin product comprises a polyfunctional urethane (meth)acrylate having a weight-average molecular weight of 1,000 or more and 60,000 or less; a monofunctional radically polymerizable compound having one radically polymerizable functional group in a molecule; a polyfunctional radically polymerizable compound other than the polyfunctional urethane (meth)acrylate; rubber particles; and a radical polymerization initiator. The monofunctional radically polymerizable compound includes a monofunctional acrylamide-based compound, and the content of the polyfunctional radically polymerizable compound other than polyfunctional urethane (meth)acrylate (particularly one having a radically polymerizable functional group equivalent of less than 300 g/eq) is controlled.

Abstract: The present invention relates to a novel serie of ?-disilyloxyketones, which are useful as photoinitiators (PIs), and to compositions comprising said photoinitiators.

Abstract: In one aspect, inks for use with a three-dimensional printing system are described herein. In some embodiments, an ink described herein comprises a thiol monomer component and an ene monomer component. Moreover, in some cases, an ink described herein further comprises an additional (meth)acrylate monomer component differing from the ene monomer component. In some such cases, the additional (meth)acrylate monomer component can be polymerized separately from the thiol and ene monomers of the ink.

Abstract: The present disclosure provides a photo-curable elastic ink composition for three-dimensional printing and the preparation method. The ink composition includes approximately 10%-75% of a soft monomer, approximately 10%-75% of a hard monomer, approximately 5%-20% of a cross-linking agent, approximately 5%-20% of a non-reactive soft resin, approximately 0.5%-10% of a photo-initiator, approximately 0%-0.5% of a colorant, and approximately 0.05%-8% of an auxiliary agent. The soft monomer is capable of generating a homopolymer with a glass transition temperature lower than about 25° C. The hard monomer is capable of generating a homopolymer with a glass transition temperature of about 25° C. or higher. The non-reactive soft resin is a resin without containing any radiation curable group in the molecular structure and having a glass transition temperature less than 0° C.

Abstract: The invention provides a UV-curable resin for forming a chemical-mechanical polishing pad comprising: (a) one or more acrylate blocked isocyanates; (b) one or more acrylate monomers; and (c) a photoinitiator. The invention also provides a method of forming a chemical-mechanical polishing pad using the UV-curable resin.

Abstract: The present invention provides a multi-phase structured UV-curable powder coating resin and a preparation method thereof, comprising (1) obtaining an emulsion of a liquid UV resin by heating the liquid UV resin and an emulsifier, dispersing, and adding deionized water for emulsification; (2) melting and dispersing a solid UV resin, a phase change agent, an emulsifier, and deionized water; adding the emulsion of the liquid UV resin with stirring to thoroughly mix; temperature is lowered during the stirring to obtain a suspension; (3) press filtering the suspension of the UV-curable powder coating resin to obtain a filter cake; (4) drying and classifying the filter cake to obtain the multi-phase structured UV-curable powder coating resin. The multi-phase structured UV-curable powder coating resin is prepared from the aforementioned method. The present disclosure has the properties of both the liquid and solid UV resin and can be sprayed as a powder coating.

Abstract: The present invention relates to a composition containing a compound (A) represented by the following general formula (I) and a compound having two or more polymerizable functional groups (B) in a molecule (except for compound (A)), wherein a mass ratio ((A)/(B)) of the compound (A) to the compound having two or more polymerizable functional groups (B) in a multi-molecule is 30/70 to 50/50: wherein, R1 and R2 each independently represent any one selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, and an aralkyl group; R3 represents any one selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, and an aralkyl group; R4 represents any one selected from the group consisting of a (meth)acryloyl group, a styryl group, and an alkenyl group having 2 to 6 carbon atoms; and n represents any integer of 1 to 5.

Abstract: A radiation curable gravure ink, comprising: cationic polymerizable compound comprising a hydroxyl-containing oxetane-based compound and an alicyclic epoxy-based compound; a cationic photoinitiator; a pigment; and filler.

Abstract: Provided is a method for producing low-molecular-weight polytetrafluoroethylene which is less likely to generate C6-C14 perfluorocarboxylic acids and salts thereof. The disclosure relates to a method for producing low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s. The method includes (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation in a substantially oxygen-free state and decomposing the high-molecular-weight polytetrafluoroethylene into a low-molecular-weight component and (2) deactivating, in a substantially oxygen-free state, at least part of main-chain radicals and end radicals generated by the irradiation and providing the low-molecular-weight polytetrafluoroethylene.

Abstract: A UV curable silicone composition has exceptional curability by ultraviolet irradiation.

Abstract: The present invention provides a photocurable composition for use in stereolithography, the photocurable composition including: a (meth)acrylic monomer (X) that is at least one selected from the group consisting of di(meth)acrylic monomers containing, within one molecule, two aromatic rings and two (meth)acryloyloxy groups, and that has a weight average molecular weight of from 400 to 580; a (meth)acrylic monomer (D) that is at least one selected from the group consisting of (meth)acrylic monomers containing, within one molecule, at least one aromatic ring and one (meth)acryloyloxy group, and that has a weight average molecular weight of from 140 to 350; and a photopolymerization initiator.

Abstract: This description relates to low VOC water borne coating compositions with improved application properties based on a binder mixture comprising an urethanized polyester and an acrylic two-step polymer. This description further relates to the use of the low VOC water borne coating compositions for forming a coating, preferably for forming a clear coat, and more preferably for forming a clear coat in refinishing applications. Moreover, this description also relates to a method of forming a multilayer coating comprising a step of forming a coating layer by using the low VOC water borne coating composition.

Abstract: Provided is a UV curable sealing material containing a vinyl chloride sol as a main ingredient, the film strength of the sealing material being not reduced even in a thin film, the sealing material thus having high resistant pressure against a hem blister. Provided is a vinyl chloride sol composition containing a vinyl chloride-based resin, a UV curable resin having a polar group (functional group), a blocked isocyanate resin, and a filler, the vinyl chloride sol composition being characterized by containing the UV curable resin having a polar group (functional group) in an amount of 20 to 100 parts by weight, the blocked isocyanate resin in an amount of 10 to 50 parts by weight, and the filler in an amount of 50 to 160 parts by weight, relative to 100 parts by weight of the vinyl chloride-based resin.