Antistatic coated polyester film
First Claim
1. A biaxially oriented polyester film comprising a polyester film support coated on one side with a latex coating, said coating including:
- stearamidopropyldimethyl-β
-hydroxy-ethylammonium nitrate, present in a concentration in the range of between 2.75% and 3.25% by weight, based on the total weight of the latex coating; and
a crosslinkable methylmethacrylate-ethyl acrylate-methacrylamide terpolymer, having a glass transition temperature in the range of between about 40°
C. and 50°
C., present in a concentration in the range of between about 0.75% and 1.25% by weight based on the total weight of the latex coating wherein the weight ratio of said stearamidopropyldimethyl-β
-hydroxy-ethylammonium nitrate to said crosslinkable methylmethacrylate-ethyl acrylate-methacrylamide terpolymer is in the range of between about 2.75;
1 and 3.25;
1.
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Accused Products
Abstract
A polyester film coated with an antistatic coating is provided. The film includes a polyester film support coated on one side with a latex coating. The coating includes stearamidopropyldimethyl-β-hydroxy-ethylammonium nitrate present in a concentration in the range of between about 2.75 percent and 3.25 percent by weight, based on the total weight of the latex coating. The coating further includes a crosslinkable methylmethacrylate-ethylacrylate-methacrylamide terpolymer having a glass transition temperature in the range of between about 40° C. and 50° C. The terpolymer is present in a concentration in the range of between about 0.75 percent and 1.25 percent by weight, based on the total weight of the latex coating. The weight ratio of the nitrate to the terpolymer ranges between about 2.75:1 to below 3:1.
A process for forming the above film is also disclosed. In this process a latex coating of the composition described above is coated onto a uniaxially drawn polyester film support. The uniaxially drawn film is then heated to drive off the water and thereafter the uniaxially coated film is stretched in a direction normal to that of the uniaxial drawn film.
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Citations
20 Claims
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1. A biaxially oriented polyester film comprising a polyester film support coated on one side with a latex coating, said coating including:
-
stearamidopropyldimethyl-β
-hydroxy-ethylammonium nitrate, present in a concentration in the range of between 2.75% and 3.25% by weight, based on the total weight of the latex coating; anda crosslinkable methylmethacrylate-ethyl acrylate-methacrylamide terpolymer, having a glass transition temperature in the range of between about 40°
C. and 50°
C., present in a concentration in the range of between about 0.75% and 1.25% by weight based on the total weight of the latex coating wherein the weight ratio of said stearamidopropyldimethyl-β
-hydroxy-ethylammonium nitrate to said crosslinkable methylmethacrylate-ethyl acrylate-methacrylamide terpolymer is in the range of between about 2.75;
1 and 3.25;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A process for forming an antistatic biaxially oriented polyester film comprising the steps of:
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applying a latex coating, said coating comprising stearamidopropyldimethyl-β
-hydroxy-ethylammonium nitrate, present in a concentration in the range of between about 2.75% and 3.25% by weight, based on the total weight of said latex coating, and a crosslinkable methylmethacrylate-ethylacrylate-methacrylamide terpolymer having a glass transition temperature in the range of between about 40°
C. and 50°
C. and present in a concentration in the range of between about 0.75% and 1.25% by weight based on the total weight of the latex coating wherein the weight ratio of said nitrate to said terpolymer is in the range of between about 2.75;
1 and 3.25;
1, to a uniaxially drawn polyester film;heating said coated, uniaxially drawn film at a temperature in the range of between about 90°
C. and 110°
C. wherein said coating is dried;stretching said coated uniaxially drawn film in a direction normal to the direction of the uniaxially drawn film wherein biaxially drawn film is produced. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification