Arkema France

Xiaoxing Dong

Jin Lu

Jinping Wu

Jingping Wu

Pressure sensitive adhesive (PSA) compositions that include at least one urethane (meth)acrylate oligomer having a molecular weight between about 2,000 g/mol and about 50,000 g/mol and an OH number of from 0.01 mg KOH/g to 100 mg KOH/g, at least one mono (meth)acrylate functional monomer and at least one tackifying resin. The PSA systems may also optionally include other additives, such as at least one initiator system that includes at least one photo-initiator or free radical initiator. The PSA systems are liquid at a temperature of 25&#xb0; C.&#xb1;2&#xb0; C. with a viscosity of 15,000 cPs or less and are adapted to form smooth, uniform coatings or films upon curing without the application of heat, whereby the resulting films have advantageous properties with respect to peel strength, tack and shear resistance. In embodiments, the PSA systems include less than 1 wt % of solvent and less than 1 wt % of water or are free of solvent and are free of water.

Pressure sensitive adhesives

Disclosed herein are coating compositions that may include at least one urethane (meth)acrylate oligomer having a molecular weight between about 2,000 g/mol and about 50,000 g/mol and at least one cycloaliphatic (meth)acrylate. The coating compositions may also optionally include at least one photo-initiator, adhesion promoter, pigment, dye and/or plasticizer. The coating compositions may be hardened, after application, by curing by exposure to radiant energy, by exposure to electron beam radiation, by exposure to heat, by exposure to chemicals and combinations thereof. Upon hardening, the coating composition typically has two phases, a soft phase which has a Tg between &#x2212;50&#xb0; C. and 0&#xb0; C. and a hard phase which has a Tg between 60&#xb0; C. and 120&#xb0; C. Methods of using the coating compositions are also described.

Removable coating systems and methods

An ethylenically unsaturated polyurethane, which is an oligomer or polymer, results from the reaction of A) an alcohol component comprising: A1) at least one hydroxylated polydiene oligomer or polymer which may optionally be alkoxylated and A2) at least one hydroxyl-functional ethylenically unsaturated compound, which is a monomer or oligomer, bearing at least one ethylenic unsaturation and B) an isocyanate component comprising at least one polyisocyanate with a functionality of at least 2, wherein the molar ratio OH/NCO is greater than 1 and wherein said polyurethane bears reactive free hydroxyl groups. Such ethylenically unsaturated polyurethanes are useful as components of curable compositions such as coatings or adhesives.

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West Chester, PA, United States of America

Xiaoxing Dong