Transparent, biaxially oriented polyester film with a high portion of cyclohexanedimethanol and a primary and secondary dicarboxylic acid portion and a method for its production and its use
A cyclohexanedimethanol, biaxially oriented technology, used in organic insulators, plastic/resin/wax insulators, photovoltaic power generation, etc., can solve problems such as inability to handle and expensive fluoropolymers
Inactive Publication Date: 2012-08-01
MITSUBISHI POLYESTER FILM
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Problems solved by technology
However, Tedlar and other fluoropolymers are expensive and will also present a major recycling problem in the future when the number of solar modules reaching the end of their life will skyrocket, as they can neither be easily recycled nor be environmentally friendly. Requirements for processing (e.g. burning)
Method used
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Embodiment
[0091] Method: The raw materials were mixed and extruded in a Japan Steel Works twin-screw extruder with degassing function. The temperature in the extruder region and in the melt line was a maximum of 275°C. The material throughput is 2000kg / hour. The melt was extruded through a flat die (at a temperature of 275°C) onto a cooling roll (30°C), followed by longitudinal stretching at 105°C by 3.2 times, and then at 110°C by 3.2 times in the transverse direction.
[0092] The film was then heat-set at 222° C. with an adjustment of 2% relaxation in the transverse direction in the final zone. In the two subsequent setting zones, 190° C. and 150° C. are adjusted and a further 3% relaxation is performed at this time. The total dwell time in heat setting was 15 seconds.
[0093] figure 1 Optional layer structures for films of the invention are indicated. The figure shows a three-layer film, the preparation of which is described in Example 1, having a base layer B (1), a skin laye...
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Abstract
The invention relates to a biaxially oriented film, predominantly formed from a polyester whose diol component includes at least 80 mol-% of 1,4-cyclohexanedimethanol (CHDM), and whose dicarboxylic acid component includes at least 80 mol-% of one or more benzenedicarboxylic acid(s) and / or one or more naphthalene dicarboxylic acid(s). The dicarboxylic acid component includes a main dicarboxylic acid component forming an at least 55 mol-% portion, chosen from either 2,6-naphthalene dicarboxylic acid or terephthalic acid. The dicarboxylic acid component further includes a secondary dicarboxylic acid component, present in an amount of at least 18 mol-%, with the secondary dicarboxylic acid component differing from the main dicarboxylic acid component. The invention further relates to a method for producing the film and its use.
Description
technical field [0001] The invention relates to a biaxially oriented film with a thickness preferably in the range of 12 to 600 μm and suitable for electrical insulation applications, in particular for backside insulation of solar cells. The film consists essentially of polyester whose diol component essentially consists of cyclohexanedimethanol. A significant (major) proportion of the dicarboxylic acid component consists of phthalic or naphthalene dicarboxylic acids, but at least 18 mol % of the dicarboxylic acid component consists of dicarboxylic acids other than the predominantly used phthalic or naphthalene dicarboxylic acids constitute. These films are characterized by their good manufacturability, very good hydrolysis capacity and good electrical insulating properties. The invention further relates to a method for producing said film and its use. Background technique [0002] Biaxially oriented films made of polyesters in this thickness range are well known. [000...
Claims
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IPC IPC(8): C08L67/02C08G63/199C08G63/78H01B3/42H01L31/048B29C48/08B29C48/91
CPCH01L31/0487C08J5/18C08J2367/02C08G63/181Y02E10/50C08G63/199H01L31/049B29C48/08B29C48/91B29C48/914C08L67/03B29C55/10
Inventor H·克利施O·克莱恩L·博特R·库尔茨
Owner MITSUBISHI POLYESTER FILM