US 5,296,571 AGranted

Methacrylate prepolymer containing triazine ring structure, its preparation, and setting composition and resin

AssigneeAica Kogyo Co., Ltd.

InventorsYutaka Hori, Takashi Kamiya, Takayuki Mano, Ryuzo Asami

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Abstract

An aminotriazine prepolymer is provided which gives resin with toughness and favorable transparency without use of filler agent by mixing 2-hydroxyethyl methacrylate (781 g: 6 mole), melamine (126 g: 1 mole), 95% by weight of p-formaldehyde (189 g: 6 mole as formaldehyde), p-toluene sulfonate (3.0 g), hydroquinone monomethyl ether (0.2 g) in a two liter separation flask with a stirring device, a thermometer, an air-inlet tube, and a cooling tube for removing the distillate. The mixture is heated while air is blown in. After the melamine and paraformaldehyde are dissolved in 2-hydroxyethyl methacrylate, at the temperature of 80.degree. C. to 100.degree. C., the reaction is continued in the temperature range of 105.degree. C. to 115.degree. C. until the quantity of extracted water is 108 g (6 mole). The triazine ring structure-containing methacrylate prepolymer thus obtained has a viscosity of 2,000 cP at 20.degree. C., a bromine number of 92.1 (Br g/100 g), and a Gardner color degree of not greater than 5.

Claims7

Dependent claims

A setting composition comprising:

a (meth)acrylate prepolymer containing a triazine ring structure, expressed as the formula:
##STR5## which is synthesized from an aminotriazine compound, paraformaldehyde, and 2-hydroxyethyl (meth)acrylate, and has an average molecular weight of two hundred to eight thousand;
and an addition polymerization initiator acting on the ethylene unsaturated bonding,
where, the value of n is on the average from 1 to 10;
R1 denotes a functional radical selected from monovalent and polyvalent functional radicals of the group consisting of radicals of the formulae:
##STR6## R2, R3, R4, R5, R8, and R9 are radicals selected from hydrogen radicals and divalent functional radicals such as --CH.sub.2 -- and --CH.sub.2 OCH.sub.2 --;
where the radical --CH2OCH.sub.2 -- links triazine rings;
R6 and R7 are monovalent functional radicals selected from hydroxyl radicals and functional radicals with ethylene unsaturation as denoted by the formula:
##STR7## and where R6 and R7 being bonded as terminal groups to the --CH.sub.2 -- radicals of R2 through R5, R8, and R9, which are not bound to a triazine ring;
at least one functional group expressed as formula (III) exists in the prepolymer;
and R10 is either a hydrogen radical or --CH.sub.3 ;
and.
wherein said setting composition is free from any additional solvent other than the 2-hydroxyethyl (meth)acrylate.

10 more elements

Dependencies are inferred from the claim text.