GB1272076A - Products in the form of foamed threads or foamed strands of polypropylene - Google Patents

Products in the form of foamed threads or foamed strands of polypropylene

Info

Publication number
GB1272076A
GB1272076A GB3860369A GB3860369A GB1272076A GB 1272076 A GB1272076 A GB 1272076A GB 3860369 A GB3860369 A GB 3860369A GB 3860369 A GB3860369 A GB 3860369A GB 1272076 A GB1272076 A GB 1272076A
Authority
GB
United Kingdom
Prior art keywords
molecular weight
foamed
propylene polymer
average molecular
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3860369A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SALEEN & CO GmbH
Original Assignee
SALEEN & CO GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19681769909 external-priority patent/DE1769909C3/en
Application filed by SALEEN & CO GmbH filed Critical SALEEN & CO GmbH
Publication of GB1272076A publication Critical patent/GB1272076A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers

Abstract

1,272,076. Foamed polypropylene filamentary materials. SALEEN G.m.b.H. & CO. 1 Aug., 1969 [3 Aug., 1968], No. 38603/69. Heading B5B. [Also in Division C3] Foamed polypropylene filamentary materials consist of a foamed stereoregular propylene polymer mixture which consists of a relatively low proportion by weight of one or more heptane-soluble, low molecular weight propylene polymers having an average molecular weight not exceeding 100,000 and selected from propylene homopolymers, copolymers and graft polymers, and a relatively high proportion by weight of one or more higher molecular weight propylene polymers selected from stereoregular propylene homopolymers, copolymers and graft polymers as the main constituent, optionally admixed with one or more further low molecular weight and heptane-soluble polymers compatible with the propylene polymers, and having an average molecular weight not exceeding 100,000. The propylene polymer mixture may be formed by gas phase polymerization and may still contain catalyst residues. The foamed stereoregular propylene polymer mixture may have an average molecular weight above 600,000 and may be derived from a non-foamed propylene polymer having the following parametres: (a) number average molecular weight Mn of 125,000, (b) a weight average molecular weight of 1,151,000, (c) a distribution of molecular weight (#Mw/)#Mn - 1) of 8.2 and density (before being formed into filamentary material) below 0.90. The average molecular weight of the foamed stereoregular propylene polymer mixture may be from 700,000 to 1,200,000. The filamentary material may consist of a propylene polymer mixture having a wide distribution of molecular weights and consist of from 5 to 35% by weight of heptane-soluble, low molecular weight propylene polymer material containing atactic and isotactic fractions having an average molecular weight of 10,000 to 100,000, together with from 95 to 65% by weight of higher molecular weight stereoregular propylene polymer material. The filamentary materials may be formed by extruding a mixture of the polymers and a 5-10 carbon atom liquid hydrocarbon as the expanding agent at a temperature between 170‹ and 220‹ C., and stretching the extrudate as soon as it issues from the extruder die without heating or compressing the extrudate. The extrudate may be stretched at a stretch ratio of from 2 : 1 to 18 : 1, preferably to 16 : 1.
GB3860369A 1968-08-03 1969-08-01 Products in the form of foamed threads or foamed strands of polypropylene Expired GB1272076A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681769909 DE1769909C3 (en) 1968-08-03 Threads or strand-like structures made of polyolefin foam

Publications (1)

Publication Number Publication Date
GB1272076A true GB1272076A (en) 1972-04-26

Family

ID=5700327

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3860369A Expired GB1272076A (en) 1968-08-03 1969-08-01 Products in the form of foamed threads or foamed strands of polypropylene

Country Status (5)

Country Link
BE (1) BE736864A (en)
CH (1) CH532131A (en)
FR (1) FR2016860A1 (en)
GB (1) GB1272076A (en)
NL (1) NL6910411A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4940736A (en) * 1988-09-12 1990-07-10 Amoco Corporation Production of low density polypropylene foam

Also Published As

Publication number Publication date
DE1769909A1 (en) 1971-08-19
NL6910411A (en) 1970-02-05
BE736864A (en) 1969-12-31
CH532131A (en) 1972-12-31
FR2016860A1 (en) 1970-05-15

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee