US3872200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing foamable pellets
Assignee: Hiroshima Kasei Ltd
•
Filing: 1972-07-03
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Granted: 1975-03-18
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Expires: 1992-07-03
Abstract
Abstract A method of producing thermoplastic synthetic resin pellets characterized by agitating a mixture comprising thermoplastic synthetic resins, stabilizers, fillers, pigments and blowing agents while slowly dropping liquid plasticizers in the mixture to form spherical pellets for material for producing sheets for covering walls, ceiling, furniture and the like surface.
Inventors
- 👤 Takao Tokito
- 👤 Yasushige Kawamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; C; C08; C08J; C08J9/00; C08J9/16; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A METHOD FOR PRODUCING FOAMABLE PELLETS HAVING DIAMETERS RANGING FROM 0.2 TO 4.0MM COMPRISING THE STEP OF AGITATING A POWDERED MIXTURE COMPRISING THERMOPLATIC SYNTHETIC RESIN SELECTED FROM THE GROUP CONSISTING OF POLYVINYL CHLORIDE AND POLYVINYL CHLORIDE COPOLYMER, STABILIZERS, FILLERS PIGMENTS AND BLOWING AGENTS AT THE TEMPERATURES WITHIN THE RANGE OF 20* -60*C IN A TANK PROVIDED WITH NOZZLES AND A STIRRER IN WHICH THE STIRRER IS ROTATING AT A ROTATIONAL SPEED WITHIN THE RANGE OF 100 - 400 R.P.M. WHILE SLOWLY DROPPING THROUGH SAID NOZZLES A PLASTICIZER FOR SAID THERMOPLASTIC RESIN IN LIQUID FORM ON TO SAID POWDERED MIXTURE, WHEREBY SAID PELLETS ARE FORMED IN SAID TANK.
Claim 2
Independent Claim
107 words
A METHOD FOR PRODUCING FOAMABLE PELLETS HAVING DIAMETERS RANGING FROM 0.2 TO 4.0MM COMPRISING THE STEP OF AGITATING A POWDERED MIXTURE COMPRISING THERMOPLATIC SYNTHETIC RESIN SELECTED FROM THE GROUP CONSISTING OF POLYVINYL CHLORIDE AND POLYVINYL CHLORIDE COPOLYMER, STABILIZERS, FILLERS PIGMENTS AND BLOWING AGENTS AT THE TEMPERATURES WITHIN THE RANGE OF 20* -60*C IN A TANK PROVIDED WITH NOZZLES AND A STIRRER IN WHICH THE STIRRER IS ROTATING AT A ROTATIONAL SPEED WITHIN THE RANGE OF 100 - 400 R.P.M. WHILE SLOWLY DROPPING THROUGH SAID NOZZLES A PLASTICIZER FOR SAID THERMOPLASTIC RESIN IN LIQUID FORM ON TO SAID POWDERED MIXTURE, WHEREBY SAID PELLETS ARE FORMED IN SAID TANK.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said polyvinyl chloride and polyvinyl chloride copolymer are emulsion polymerization resin.
Claim 4
Independent Claim
197 words
A method for producing foaming pellets having diameters ranging from 0.2 to 4.0mm comprising the step of agitating a powdered mixture comprising 80 - 120 parts by weight of thermoplastic synthetic resin selected from the group consisting of polyvinyl chloride and polyvinyl chloride copolymer, 2 - 8 parts by weight of stabilizer, 20 - 40 parts by weight of filler, 4-6 parts by weight of pigment and 8 - 12 parts by weight of blowing agent at a temperature within the range of 20*- 60*C in a tank provided with nozzles and a stirrer in which the stirrer is rotating at a rotational speed within the range of 100 - 400 R.P.M. while slowly dropping through said nozzles 50 - 150 parts by weight of a mixture comprising 80 - 120 parts by weight of said thermoplastic synthetic resin, 2 - 8 parts by weight of stabilizer, 20 - 40 parts by weight of filler, 4 - 6 parts by weight of pigment, 8 - 12 parts by weight of blowing agent and 20 - 130 parts by weight of plasticizer for said thermoplastic resin over said powdered mixture whereby said pellets are formed in said tank.
Claim 5
Independent Claim
197 words
A method for producing foaming pellets having diameters ranging from 0.2 to 4.0mm comprising the step of agitating a powdered mixture comprising 80 - 120 parts by weight of thermoplastic synthetic resin selected from the group consisting of polyvinyl chloride and polyvinyl chloride copolymer, 2 - 8 parts by weight of stabilizer, 20 - 40 parts by weight of filler, 4-6 parts by weight of pigment and 8 - 12 parts by weight of blowing agent at a temperature within the range of 20*- 60*C in a tank provided with nozzles and a stirrer in which the stirrer is rotating at a rotational speed within the range of 100 - 400 R.P.M. while slowly dropping through said nozzles 50 - 150 parts by weight of a mixture comprising 80 - 120 parts by weight of said thermoplastic synthetic resin, 2 - 8 parts by weight of stabilizer, 20 - 40 parts by weight of filler, 4 - 6 parts by weight of pigment, 8 - 12 parts by weight of blowing agent and 20 - 130 parts by weight of plasticizer for said thermoplastic resin over said powdered mixture whereby said pellets are formed in said tank.
Claim 6
Dependent Claim
26 words
The method of claim 3 wherein said polyvinyl chloride and said polyvinyl chloride copolymer are emulsion polymerization resin and wherein the rotational speed is 120 R.P.M.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |