摘要:
The disclosed photosensitive flexographic printing plate composition is to impart a soft printing plate by rubber compounding photosensitive resin which comprises(A) 5-50 wt % of a photopolymerizable prepolymer consisting essentially of a component having the general formula ##STR1## where, R is an alkylene group or polyoxyalkylene group having 2-8 carbons, R.sub.1 is an H or CH.sub.3 group, R.sub.2 and R.sub.3 are diisocyanate residues, R.sub.4 is a portion excluding a hydroxyl group of dienic liquid rubber having a hydroxyl group of dihydric alcohol having less than 2000 molecular weight of the general formula ##STR2## where, R.sub.5 is an alkylene group having 2-8 carbons, R.sub.6 and R.sub.7 are an H, CH.sub.3 or acryloyloxy, methacryloyloxy, allyloxy group, X is a residue excluding hydroxyl group(s) of a dienic liquid rubber having hydroxyl group(s), l is an integer of 1-4, m is 1
摘要:
An object of the present invention is to provide a radiation resistant polymer composition for maintaining appropriate physical properties after it is exposed to radiation. The invention provides a radiation resistant cross linked polymer composition comprising polymer components and a softening agent in an amount of 3 weight parts or more with respect to 100 weight parts of the polymer components. The polymer components comprise a first polymer component of one or more polymer selected from the group consisting of butyl rubber, polyisobutylene rubber, epichlorohydrin rubber and polypropylene in a content of 3 to 70 weight parts and a second polymer component of one or more polymer selected from the group consisting of chloroprene rubber and a polymer containing an ethylene unit as a main component in a content of 97 to 30 weight parts.
摘要:
A method is provided including a step of preparing a base member; a step of preparing a metal mold which comprises a reference surface and plural projection-shaping die parts which have ring-like protruding sections projecting from a reference surface and surrounding hollow spaces which are shaped to match with the profiles of the projections; a step of placing a thermoplastic or thermosetting sheet-like molding material on the base member; a step of pressing the metal mold against the molding material placed on the base member, pressurizing the molding material at least with the ring-like protruding sections and accordingly bonding the molding material thus pressurized with the ring-like protruding sections to the base member, and forming and shaping projections from the molding material which is opposed against the insides of the hollow spaces surrounded by the ring-like protruding sections; and a step of leaving on the base member the molding material which is opposed against the plural projection-shaping die parts and stripping off the molding material other than the molding material which is opposed against the plural projection-shaping die parts.
摘要:
A method is provided including a step of preparing a base member; a step of preparing a metal mold which comprises a reference surface and plural projection-shaping die parts which have ring-like protruding sections projecting from a reference surface and surrounding hollow spaces which are shaped to match with the profiles of the projections; a step of placing a thermoplastic or thermosetting sheet-like molding material on the base member; a step of pressing the metal mold against the molding material placed on the base member, pressurizing the molding material at least with the ring-like protruding sections and accordingly bonding the molding material thus pressurized with the ring-like protruding sections to the base member, and forming and shaping projections from the molding material which is opposed against the insides of the hollow spaces surrounded by the ring-like protruding sections; and a step of leaving on the base member the molding material which is opposed against the plural projection-shaping die parts and stripping off the molding material other than the molding material which is opposed against the plural projection-shaping die parts.
摘要:
A radiation resistant cross linked polymer composition for maintaining appropriate physical properties after it is exposed to radiation comprising polymer components and a softening agent in an amount of 3 weight parts or more with respect to 100 weight parts of the polymer components. The polymer components comprise a first polymer component of one or more polymer selected from the group consisting of butyl rubber, polyisobutylene rubber, epichlorohydrin rubber and polypropylene in a content of 3 to 70 weight parts and a second polymer component of one or more polymer selected from the group consisting of chloroprene rubber and a polymer containing an ethylene unit as a main component in a content of 97 to 30 weight parts.