Radiation curable composition
A radiation-curable, composition-based technology, applied in the direction of adhesive types, ester copolymer adhesives, coatings, etc., that can solve problems that are not suitable for radiation-curable applications
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Embodiment 1
[0226] Example 1: Preparation of water-insoluble (meth)acrylic acid polymer (AP) comprising pendant hydroxyl groups
[0227] The types and amounts of reagents used to prepare compounds APa-APd are summarized in Table 1.
[0228] Butyl acetate (initial charge) was charged to a 2000 ml three-neck circular glass reactor. The reactor was purged with nitrogen and heated to 120°C. A solution of the monomer mixture described in Table 1 and the initiator (TAPEH) in butyl acetate was fed continuously to the reaction mixture at 140° C. during 4 hours under vigorous stirring. To achieve complete conversion of the monomer, a one-hour monomer-tracking step was performed at the reaction temperature by additional addition of initiator. The reaction temperature was then maintained at 125°C for an additional 2 hours to decompose most of the unreacted thermal initiator.
[0229] Table 1
[0230] APa APb APc AP HPMA 378 378 346.56 420 Stylized 90 90 ...
Embodiment 2
[0231] Example 2: Preparation of a radiation curable composition (X) comprising a (meth)acrylylated acrylic polymer (AA) comprising pendant hydroxyl groups
[0232] The types and amounts of reagents used to prepare compositions X1-X5 are summarized in Table 2.
[0233] Isophorone diisocyanate was charged to a 1000 L reactor with bismuth neodecanoate, butylated hydroxytoluene and butyl acetate under air purge. The reactor was heated to 60°C. PETIA was added dropwise within 2 hours and the reaction was carried out at a temperature not exceeding 65 °C until the specified isocyanate group content was reached. The diluted acrylic acid intermediate AP was then added to the reaction mixture along with additional bismuth neodecanoate, butylated hydroxytoluene and butyl acetate and heated to 85°C. Curing at 85°C results in a specific isocyanate group content not exceeding 0.015 meq / g.
[0234] Table 2
[0235]
[0236] Viscosity at 25°C (mPas) 214 657 665 2800 131...
Embodiment 3
[0239] Example 3: Comparative composition comprising an acrylic polymer comprising hydroxyl groups
[0240] Neither of the two hydroxyl-containing acrylic polymers contained in the compositions Comp1 and Comp2 were acrylated. In fact, no isocyanate-containing monomers forming at least one (meth)acrylate group capable of grafting a methacrylate functional group in the backbone of the water-insoluble ethylenically unsaturated polymer comprising pendant hydroxyl groups adducts.
[0241] The types and amounts of components used to prepare compositions Comp1 and Comp2 are summarized in Table 3.
[0242] table 3
[0243]
[0244] Quantities are in grams.
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