| 摘要 |
PROBLEM TO BE SOLVED: To obtain a double glazing having easy handling property, transparency, excellent heat insulating property and sound insulating property without causing splashing of glass flakes by using a gelling agent consisting of the reaction product of an ammonia reaction product (A) with a copolymer of ethylenic unsatd. compd. and maleic acid anhydride and gelatin (B). SOLUTION: The compsn. ratio of the ethylenic unsatd. compd. and the maleic acid anhydride is 100:1 to 1:100, and the weight average mol.wt. of the copolymer is 2,000 to 5×106. The reaction ratio of the copolymer and ammonia is 0.5 to 2 mol. of ammonia to 1 mol of maleic acid anhydride group. The viscosity of the reaction product (at 25 deg.C) is 5 to 1×105 cps. As for the gelatin, alkali treated gelatin, acid treated gelatin or gelatin hydrolyzed product are used. The proportion of the components is that the component (A) is 3 to 50 parts by mass to 100 parts by mass of the component (B). The gel strength of the reaction product is preferably 10 to 500 g. The distance between glass sheets of the double glazing is usually controlled to 3 to 20 mm.
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