| 摘要 |
PURPOSE:To provide an adiabatic door for a refrigerator, etc., strong in the adhesivity of a cap door to an urethane resin adiabatic material used HCFC 123 as a foaming agent and not causing cracking and discoloration of the cap door by employing the resin cap door comprising a specific material. CONSTITUTION:The objective product is produced by integrally foaming an urethane adiabatic material in a adiabatic space formed from a resin cap door and a metal door surface plate. The adiabatic material is produced from an organic polyisocyanate containing 40-90wt.% of polymeric MDI, etc., as a NCO component, while HCFC 123, HCFC 141b or their mixture is used as the foaming agent. The resin cap door comprises a composition containing a graft copolymer produced by copolymerizing 30-50wt.% of (i) a vinyl cyanide compound with (ii) 50-70wt.% of an aromatic vinyl compound in the presence of a conjugated dienic rubber, a copolymer comprising 30-50wt.% of the component i and 50-70wt.% of the component ii, and n-butyl acrylate/n-propyl acrylate copolymer coated with the copolymer comprising 30-50wt.% of the component i and 50-70wt.% of the component ii. |
