Method of making fiber reinforced polyamide sheets

• US 4,985,102 A
• Filed: 04/09/1990
• Issued: 01/15/1991
• Est. Priority Date: 07/17/1986
• Status: Expired due to Term

• Current Assignee: Liqui-Box Canada Incorporated (Corteva, Inc.)
• Original Assignee: Du Pont Taiwan Limited (Corteva, Inc.)
• Inventors: Chatsick, James J., Sipos, Peter A.
• Primary Examiner(s): Hoke, Veronica P.
• Application Number:
  US07/506,148
• Time in Patent Office: 281 Days
• Field of Search: 524/413, 524/606, 428/293, 428/475.2, 428/475.5, 428/479.3, 156/62.2, 156/324, 156/163, 156/176
• US Class Current: 156/163
• CPC Class Codes: A01G 9/1438 Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
• CPC Class Codes: B29C 33/68 Release sheets
• CPC Class Codes: B29C 37/0075 using release sheets
• CPC Class Codes: B29K 2077/00 Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• CPC Class Codes: C08J 2377/00 Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08J2379/06; of polyamide-imides or polyamide acids C08J2379/08; Derivatives of such polymers
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08K 3/16 Halogen-containing compounds
• CPC Class Codes: C08K 5/098 Metal salts of carboxylic acids
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: Y02A 40/25 Greenhouse technology, e.g. cooling systems therefor
• CPC Class Codes: Y10T 428/31736 Next to polyester
• CPC Class Codes: Y10T 428/31739 Nylon type
• CPC Class Codes: Y10T 428/31779 Next to cellulosic

Abstract

An oriented nylon film, useful as a carrier web in the manufacture of fibrous reinforced resin sheets, is disclosed. Oriented nylon film containing a salt selected from at least one copper salt, at least one alkali metal halide, at least one alkaline earth metal halide or mixtures thereof is disclosed. The nylon film is preferably nylon 6, nylon 66, nylon 66/6 and/or mixtures thereof and the salt is preferably a copper salt, especially cupric acetate or cupric iodide, or potassium bromide.

Claims

1. A method for manufacturing fibrous reinforced resin sheet wherein either (a) the material for such sheet is fed onto a carrier web of an oriented film, or (b) the material for such sheet is fed onto a carrier web, a top web is fed onto the top of the material and the resulting sandwich of top web, material and carrier web is passed through constricting means for controlling the thickness and shape of the transverse section of the sandwich, and wherein at least one of the top web and carrier web is an oriented nylon film;

the improvement wherein the nylon film contains an additive selected from at least one copper salt, at least one alkali metal salt, at least one alkaline earth metal salt and mixtures thereof.

2. A method according to claim 1 wherein the nylon is nylon 6, nylon 66, nylon 66/6 or mixtures thereof.

3. A method according to claim 2 wherein the nylon film is monoaxially oriented.

4. A method according to claim 3 wherein the additive is selected from acetates, butyrates, laurates, palmitates, stearates and iodides of copper.

5. A method according to claim 4 wherein the additive is selected from acetates, butyrates, laurates, palmitates, stearates, and iodides of copper.

6. A method according to claim 4 wherein the additive is present in a concentration of at least 10 ppm Cu.

7. A method according to claim 6 wherein the additive is present in a concentration of from 20 to 150 ppm Cu.

8. A method according to claim 3 wherein the additive is selected from iodides, bromides and chlorides of sodium, potassium and magnesium.

9. A method according to claim 8 wherein the additive is potassium bromide.

10. A method according to claim 8 wherein the additive is present in a concentration of at least 0.05 wt %.

11. A method according to claim 9 wherein the additive is present in a concentration of at least 0.05 wt. %.