GB823953A - Improvements in or relating to the production of sheets and films of normally solid polyethylene plastics - Google Patents

Improvements in or relating to the production of sheets and films of normally solid polyethylene plastics

Info

Publication number
GB823953A
GB823953A GB1075656A GB1075656A GB823953A GB 823953 A GB823953 A GB 823953A GB 1075656 A GB1075656 A GB 1075656A GB 1075656 A GB1075656 A GB 1075656A GB 823953 A GB823953 A GB 823953A
Authority
GB
United Kingdom
Prior art keywords
film
sheet
polyethylene
films
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
GB1075656A
Inventor
Richard Arthur Rose
Charles Richard Bruce
Dennis Alexander John Noble
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.)
British Cellophane Ltd
Original Assignee
British Cellophane Ltd
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 British Cellophane Ltd filed Critical British Cellophane Ltd
Priority to GB1075656A priority Critical patent/GB823953A/en
Publication of GB823953A publication Critical patent/GB823953A/en
Expired legal-status Critical Current

Links

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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

Substantially clear and transparent polyethylene sheets and films are made by incorporating in polyethylene, having an average molecular weight of 20,000 to 35,000 (determined by osmotic measurements), from 0.02 to 0.2% by weight of an unsaturated aliphatic fatty acid amide of 12-22 carbon atoms containing a single ethylenic bond, extruding the molten polyethylene through a die orifice to form a sheet or film having a temperature of 230-330 DEG C., preferably 250-300 DEG C., drawing the freshly formed sheet or film through an air path 2-18 inches long out of contact with any solid object and at the same time reducing the thickness of the sheet or film to 0.001-0.01 inch by stretching, solidifying the sheet or film by cooling it to below 50 DEG C., preferably to 0-25 DEG C., and passing the solidified sheet or film to a take-up device. The polyethylene may contain a plasticizer, such as polyisobutylene. In the example, a polyethylene having an average molecular weight of 28,000 and containing 0.1% by weight of n-octadecenamide is extruded at 250 DEG C. in the form of sheet through a narrow slot-shaped die first along an air path 4 inches long, and then into a bath of water at 40 DEG C. Thereafter the film is passed through squeeze rollers to remove excess water and is drawn by means of pull-rollers to a wind-up roll. The finished film is clear and transparent and is 0.0015 inch thick. Specification 694,870 is referred to.
GB1075656A 1956-04-09 1956-04-09 Improvements in or relating to the production of sheets and films of normally solid polyethylene plastics Expired GB823953A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1075656A GB823953A (en) 1956-04-09 1956-04-09 Improvements in or relating to the production of sheets and films of normally solid polyethylene plastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1075656A GB823953A (en) 1956-04-09 1956-04-09 Improvements in or relating to the production of sheets and films of normally solid polyethylene plastics

Publications (1)

Publication Number Publication Date
GB823953A true GB823953A (en) 1959-11-18

Family

ID=9973686

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1075656A Expired GB823953A (en) 1956-04-09 1956-04-09 Improvements in or relating to the production of sheets and films of normally solid polyethylene plastics

Country Status (1)

Country Link
GB (1) GB823953A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2515059A1 (en) * 1974-04-29 1975-11-13 Goodyear Tire & Rubber THERMOPLASTIC MASS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2515059A1 (en) * 1974-04-29 1975-11-13 Goodyear Tire & Rubber THERMOPLASTIC MASS

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