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公开(公告)号:US3547792A
公开(公告)日:1970-12-15
申请号:US3547792D
申请日:1968-02-16
申请人: GRACE W R & CO
发明人: PATTERSON WILLIAM A
CPC分类号: B29C71/04 , B29C61/003 , B29K2071/00
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公开(公告)号:US3316676A
公开(公告)日:1967-05-02
申请号:US43692565
申请日:1965-03-03
申请人: GRACE W R & CO
CPC分类号: A01G7/00 , A01C1/046 , Y10S260/43
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公开(公告)号:US3432447A
公开(公告)日:1969-03-11
申请号:US3432447D
申请日:1963-09-09
申请人: GRACE W R & CO
CPC分类号: C08J9/0061 , C08J2323/04 , C08J2425/00 , Y10S264/05 , Y10S264/18 , Y10S521/915
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公开(公告)号:US3429794A
公开(公告)日:1969-02-25
申请号:US3429794D
申请日:1964-04-13
申请人: GRACE W R & CO
发明人: PATTERSON WILLIAM A
CPC分类号: B29C61/003 , B29K2071/00
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公开(公告)号:US3425541A
公开(公告)日:1969-02-04
申请号:US3425541D
申请日:1964-12-03
申请人: GRACE W R & CO
发明人: PATTERSON WILLIAM A
CPC分类号: C08J5/18 , C08J2371/00
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公开(公告)号:US3087845A
公开(公告)日:1963-04-30
申请号:US76174158
申请日:1958-09-18
申请人: GRACE W R & CO
发明人: PATTERSON WILLIAM A
CPC分类号: B29C66/7371 , B29C65/02 , B29C65/1445 , B29C65/1448 , B29C65/1464 , B29C65/18 , B29C65/222 , B29C65/743 , B29C66/1122 , B29C66/137 , B29C66/344 , B29C66/43 , B29C66/43121 , B29C66/432 , B29C66/71 , B29C66/73711 , B29C66/73713 , B29C66/73715 , B29C66/73754 , B29C66/73921 , B29C66/73941 , B29C66/8242 , B29C66/8322 , B29C66/83221 , B29C2049/0063 , B29K2995/0049 , B29K2995/0053 , B29L2031/7128 , Y10T428/15 , Y10T428/24777 , B29K2023/12 , B29K2023/0691 , B29K2023/06
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公开(公告)号:US3592785A
公开(公告)日:1971-07-13
申请号:US3592785D
申请日:1968-12-05
申请人: GRACE W R & CO
CPC分类号: C08J9/10 , C08J2323/02 , Y10S264/05 , Y10S264/18 , Y10S264/65 , Y10S521/915
摘要: A PROCESS FOR PREPARING POLYETHYLENE FOAM CONSISTING ESSENTIALLY OF FORMING A MIXTURE OF SOLID POLYETHYLENE AND NORMALLY SOLID, HEAT DECOMPOSABLE ORGANIC FOAMING AGENT HAVING A DECOMPOSITION TEMPERATURE AT LEAST ABOUT 10*C. ABOVE THE MELTING POINT OF THE POLYETHYLENE MATERIAL; SUBJECTING SAID ADMIXTURE TO HIGH ENERGY IONIZING RADIATION TO PRODUCE A PERCENT GEL OF ABOUT 30 TO ABOUT 80; HEATING THE IRRADIATED BODY IN STAGES, FIRST AT A TEMPERATURE SLIGHTLY BELOW THE DECOMPOSITION POINT OF THE FOAMING AGENT AND IMMEDIATELY THEREAFTER RAPIDLY HEATING TO A TEMPERATURE WELL ABOVE THE DECOMPOSITION POINT TO FORM AN EXPANDED BODY AND COOLING THE HEATED BODY TO A TEMPERATURE BELOW THE FREEZING POINT OF THE POLYETHYLENE.
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