| abstract |
PURPOSE: To obtain titled sheet with each specific surface tension and surface hardness, capable of removing dusts and of preventing insect pests intrusion and fungi development, by incorporating specific amount(s) of tackifier etc. such as coumarone resin and vulcanizing agent in rubber material such as butadiene rubber to form vulcanized rubber sheet. n CONSTITUTION: The objective sheet can be obtained by incorporating (A) 100pts. wt. of at least one sort of rubber material selected from butadiene rubber, styrene-butadiene rubber, butyl rubber etc. with (B) 5W30pts.wt. of at least one sort of tackifier selected from coumarone resin, petroleum-based hydrocarbon resin, isobutylene resin, rosin derivatives etc. and (C) as other ingredients, vulcanizing agent (e.g. sulfur), vulcanizing promotor and filler (e.g., calcium carbonate) followed by performing vulcanization. This sheet has the following characteristics: (i) surface tension ... at such level that the surface tack is represented by ball No. 3W10 determined by the J. Dow ball-tack method, (ii) surface hardness ... at such level that the HS value is 20W45 determined by the JIS spring hardness test A-form procedure. n COPYRIGHT: (C)1985,JPO&Japio |