UST981003I4 - Filled, biaxially oriented, thermoplastic film having preferential shrinkage and method of making such film - Google Patents

Filled, biaxially oriented, thermoplastic film having preferential shrinkage and method of making such film Download PDF

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Publication number
UST981003I4
UST981003I4 US05/923,569 US92356978A UST981003I4 US T981003 I4 UST981003 I4 US T981003I4 US 92356978 A US92356978 A US 92356978A US T981003 I4 UST981003 I4 US T981003I4
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US
United States
Prior art keywords
film
shrinkage
temperature
filled
polymer
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.)
Pending
Application number
US05/923,569
Inventor
Lester R. Bartron
Samuel P. Anderson
Rudolph H. Michel
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Application granted granted Critical
Publication of UST981003I4 publication Critical patent/UST981003I4/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S524/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S524/921—Elastic memory or heat shrinkable compositions

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

a filled, biaxially oriented, void-containing thermoplastic film suitable for making heat-shrinkable bands is provided having shrinkage on heating to 100° C. of greater than 5%, which shrinkage in turn is at least 5% greater than the shrinkage in a direction perpendicular thereto.
A process for preparing this film with its preferential shrinkage is provided including the steps of:
(a) melt-blending a C2 -C10 α-monoolefin polymer and at least 20 weight percent inert filler, based on the total weight of polymer and filler;
(b) forming a film from the melt blend;
(c) cooling the film to a temperature below the melting point;
(d) biaxially stretching the film at least about twice its original forming dimensions in mutually perpendicular directions while the film temperature is above the line-drawing temperature and below the polymer melting temperature, until the film has at least about 30% voids;
(e) cooling the film to room temperature; and
(f) post-stretching the biaxially stretched film in a selected direction at a temperature below 100° C. to an extent that provides the above-mentioned preferential shrinkage in the filled film.
US05/923,569 1978-03-03 1978-07-11 Filled, biaxially oriented, thermoplastic film having preferential shrinkage and method of making such film Pending UST981003I4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88298378A 1978-03-03 1978-03-03

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US88298378A Continuation 1978-03-03 1978-03-03

Publications (1)

Publication Number Publication Date
UST981003I4 true UST981003I4 (en) 1979-04-03

Family

ID=25381741

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/923,569 Pending UST981003I4 (en) 1978-03-03 1978-07-11 Filled, biaxially oriented, thermoplastic film having preferential shrinkage and method of making such film

Country Status (1)

Country Link
US (1) UST981003I4 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5460878A (en) * 1992-10-26 1995-10-24 Applied Extrusion Technologies, Inc. Heat sealable shrink laminate
US5851610A (en) * 1991-02-07 1998-12-22 Applied Extrusion Technologies, Inc. Shrink films and articles including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5851610A (en) * 1991-02-07 1998-12-22 Applied Extrusion Technologies, Inc. Shrink films and articles including the same
US5460878A (en) * 1992-10-26 1995-10-24 Applied Extrusion Technologies, Inc. Heat sealable shrink laminate

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