초록 ▼

A plastic foam material composed of a blended resin composition which includes at least two thermoplastic resins and a silane-modified based resin. The blended resin composition consists essentially of 100 parts by weight of at least two thermoplastic resins, from about 1 to about 50 parts by weight

A plastic foam material composed of a blended resin composition which includes at least two thermoplastic resins and a silane-modified based resin. The blended resin composition consists essentially of 100 parts by weight of at least two thermoplastic resins, from about 1 to about 50 parts by weight of a silane-modified, cross-linked, thermoplastic resin; from about 0.001 to about 2.5 parts by weight of a cross-linking catalyst for use in a silane compound and from about 1 to about 20 parts by weight of a foaming agent. According to one embodiment of the present invention, the thermoplastic resins include at least two substantially incompatible and substantially uncross-linked thermoplastic resins, while in another embodiment the two thermoplastic resins need not be substantially incompatible. The blended resin composition may further include reinforcers such as glass fibers and filler. The thermodecomposition foaming agent decomposes at sufficiently high temperatures to yield a plastic foam material. The resultant plastic foam material, in turn, exhibits superior resilience, improved compression strength and superior heat-insulating properties. A method to produce the plastic foam material from foamable tubes and foamable pieces is also disclosed.

대표청구항 ▼

A method for forming a tubular-celled resin sheet comprising: forming an uncross-linked resin tube containing a foaming agent; cross-linking said resin tube without activating said foaming agent; cutting said resin tube into substantially uniform lengths; arranging a plurality of said uniform length

A method for forming a tubular-celled resin sheet comprising: forming an uncross-linked resin tube containing a foaming agent; cross-linking said resin tube without activating said foaming agent; cutting said resin tube into substantially uniform lengths; arranging a plurality of said uniform lengths upon a surface with axes thereof parallel to each other; peripheral surfaces of substantially all of said uniform lengths being in contact with peripheral surfaces of adjacent uniform lengths; limiting an upper end of said uniform lengths; and activating said foaming agent, whereby a unitary tubular-celled resin sheet is formed by adherence of peripheral surfaces to each other.