Process for producing synthetic resin foam
OwnerShigeru Motani, Tadayuki Saito +1inventors
InventorsShigeru Motani, Tadayuki Saito, Takahiro Hayashi
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Abstract
The present invention concerns a process for producing a synthetic resin foam composed of cells having substantially two sizes, one of the sizes being at most 0.3 mm and the other size as being 0.4 to 1 mm, comprising the steps of: forming a mixture of one or more of a water-absorbent high molecular compound, a cell-controlling agent, a synthetic resin, and water; melting the mixture with heating; incorporating a volatile type foaming agent into the mixture under pressure; and extruding the mixture into a lower pressure space to form a foam.
Claims36
A process for producing a synthetic resin foam composed of cells having two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of:
- forming a mixture of a water-absorbent high molecular weight organic compound having the capacity of absorbing at least 200 g of pure water per one gram of the compound, a cell controlling agent and a synthetic resin;
- kneading and melting the mixture with heating;
- incorporating water together with a volatile-type foaming agent into the mixture under pressure;
- and
- extruding the mixture into a lower pressure space to form a foam.
A process for producing a synthetic resin foam composed of cells having two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of:
- forming a mixture of a water-absorbent high molecular weight organic compound having the capacity of absorbing at least 200 g of pure water per one gram of the compound, a cell controlling agent and a synthetic resin;
- adding water little by little to the mixture while or after mixing the mixture;
- introducing the mixture into an extruder;
- kneading and melting the resulting mixture with heating;
- incorporating a volatile-type foaming agent into the mixture under pressure;
- and
- extruding the mixture into a lower pressure space to form a foam.
A process for producing a synthetic resin foam composed of cells having two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of:
- forming a mixture of water, a cell controlling agent and a synthetic resin;
- adding a water-absorbent high molecular weight organic compound having the capacity of absorbing at least 200 g of pure water per one gram of the compound to the mixture and mixing them;
- introducing the mixture into an extruder;
- kneading and melting the mixture with heating;
- incorporating a volatile-type foaming agent into the mixture under pressure;
- and
- extruding the mixture into a lower pressure space to form a foam.
A process for producing a synthetic resin foam composed of cells having two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of:
- forming a mixture of water and a synthetic resin;
- adding a water-absorbent high molecular weight organic compound having the capacity of absorbing at least 200 g of pure water per one gram of the compound and a cell controlling agent to the mixture;
- introducing the mixture into an extruder;
- kneading and melting the resulting mixture with heating;
- incorporating a volatile-type foaming agent into the mixture under pressure;
- and
- extruding the mixture into a lower pressure space to form a foam.
A process for producing a synthetic resin foam composed of cells having two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of:
- (1) forming a mixture of a water-absorbent high molecular weight compound selected from the group consisting of polyacrylic salts, starch acrylic acid salt graft copolymers, vinyl alcohol-acrylic acid copolymers, and polyvinyl alcohol resin;
- a cell controlling agent;
- and a synthetic resin;
- (2) kneading and melting the mixture with heating;
- (3) incorporating water together with a volatile-type foaming agent into the mixture under pressure;
- and (4) extruding the mixture into a lower pressure space to form a foam.
A process for producing a synthetic resin foam composed of cells having two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of:
- (1) forming a mixture of water, a water-absorbent high molecular weight compound selected from the group consisting of polyacrylic salts, starch acrylic acid salt graft copolymers, vinyl alcohol-acrylic acid copolymers, and polyvinyl alcohol resin, a cell controlling agent, and a synthetic resin;
- (2) kneading and melting the mixture with heating;
- (3) incorporating water together with a volatile-type foaming agent into the mixture under pressure;
- and (4) extruding the mixture into a lower pressure space to form a foam.
Dependencies are inferred from the claim text.