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Light-transmitting fluoropolymer compositions and articles

A technology of polymers and compositions, applied in the direction of tubular articles, synthetic resin layered products, layered products, etc., can solve problems such as undesired environment for workers

Active Publication Date: 2019-12-03
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution does not address the environment where workers do not expect

Method used

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  • Light-transmitting fluoropolymer compositions and articles
  • Light-transmitting fluoropolymer compositions and articles
  • Light-transmitting fluoropolymer compositions and articles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0224] The fluoropolymer ("THV220") was dry mixed with 0.1% by weight calcium carbonate ("SOCAL31") in a drum drum at 10 rpm for 5 minutes. The mixture of powder-coated pellets was fed at 2.7 kg / hr (6 lb / hr) into a 25 mm twin-screw extruder ("Werner & Phleiderer") and extruded at 6.1 m / min through a conventional coat hanger design film die. Out onto cooled casting wheels. The resulting film had a thickness of 25 microns (1 mil), a haze level of 1.8% and a light transmission of 96.5% as measured with a haze meter ("Hazegard Plus BYK"). The hydrogen fluoride gas content measured at the lip of the extruded film die was 0 ppm. An HF gas meter (from Analytical Technology Inc., Collegeville, PA) was used for the measurements.

Embodiment 2

[0226]An aqueous solution containing 0.1 wt% calcium carbonate was injected at a rate of 1.4 kg / hr (3 lb / hr) into a 25 mm twin screw extruder ("Werner & Phleiderer") through the barrel injection port downstream of the polymer melting section. The feed rate of the fluoropolymer ("THV220") pellets was 2.7 kg / hr (6 lb / hr). After mixing with the molten fluoropolymer ("THV220"), the steam generated from the evaporated water exited the second twin-screw extruder port. The resulting mixture of fluoropolymer ("THV220") and 0.05% by weight calcium carbonate was extruded into strands and cut into pellets using a conventional strand die and pelletizer. No hydrogen fluoride gas was measured at the polymer strand die. Pellets of fluoropolymer containing 0.05% by weight calcium carbonate ("THV220") were hot pressed at a pressure of 249°C (480°F) into 25 micron (1 mil) films. The resulting film had a haze level of 1.5% measured with a haze meter ("Hazegard Plus BYK") and a light transmitta...

Embodiment 3

[0228] Fluoropolymer films were prepared as in Example 2, except that an aqueous solution containing 0.1% by weight potassium carbonate was injected into the extruder and melt mixed with fluoropolymer ("THV220") pellets. The resulting mixture of fluoropolymer ("THV220") and 0.05% by weight potassium carbonate was extruded into strands and cut into pellets. No hydrogen fluoride gas was measured at the polymer strand die. Pellets of fluoropolymer containing 0.05% by weight potassium carbonate ("THV220") were hot pressed at 249°C (480°F) under pressure to form 25 micron (1 mil) films. The obtained film had a haze level of 1.1% and a light transmittance of 96.6% as measured with a haze meter ("Hazegard Plus BYK").

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Abstract

Disclosed herein are light transmissive fluoropolymer compositions having a haze of less than 2% comprising alkali metal (e.g. lithium, sodium and potassium) cations and corresponding anions ( For example, CO 3 , OH, OOCCH 3 ) or alkaline earth metal cations (e.g., calcium, magnesium, strontium, and barium) and corresponding anions (e.g., CO 3 , OH, OOCCH 3 ), wherein the light transmissive fluoropolymer has a visible light transmittance of at least 90%. Exemplary uses of the light transmissive fluoropolymer compositions described herein include as films (e.g., solar reflective films, solar transparent front photovoltaic films, commercial graphic cover films, commercial graphic films, and tubes (e.g., transparent Tube)).

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 62 / 013796, filed June 18, 2014, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] Extrusion processing of fluoropolymers can produce degradation by-products, such as hydrofluoric acid, which are corrosive to common extrusion processing equipment and can create an undesirable environment for workers. A relatively expensive solution is to manufacture fluoropolymer extrusion processing equipment from high nickel content stainless steels such as Hastelloy and Inconel. This solution does not address circumstances where workers are not expected. Additionally, high nickel content stainless steels are softer and have a tendency to wear faster. There is a need for alternative extrusion processing of fluoropolymers that addresses these corrosive effects and worker undesirable environments to comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/12C08L27/18C08L33/12C08K3/26B32B27/30
CPCB32B27/08B32B27/304C08J5/18C08K3/26C08L27/12C08L27/18C08J2327/18C08J2327/12C08K2003/265C08K2003/262C08K2201/011C08K2201/003C08L2203/16C08K5/005C08K5/3435C08K3/105B32B27/18B32B27/283B32B27/285B32B27/302B32B27/308B32B27/32B32B27/322B32B3/30B32B2250/24B32B2250/44B32B2264/102B32B2264/104B32B2307/412B32B2307/732B32B2457/12B32B2535/00B32B2590/00B32B2597/00C08L33/12F24S70/30F24S80/52C08L27/16C08J2327/16C08J2327/20C08K5/17C08L27/20
Inventor 蒂莫西·J·赫布林克
Owner 3M INNOVATIVE PROPERTIES CO