Scratch-resistant and abrasion-resistant transparent polyurethane film with energy-absorbing and antifogging properties, process of production, and window panes using it
First Claim
1. A process of producing a transparent polyurethane film of high optical quality which is a useful component of safety glass as an external film, having energy-absorbing properties and whose scratch-resistance and abrasion resistance is improved by surface treatment, which comprises:
- applying onto an exposed surface of a substrate, by reactive casting or reactive spraying, a reaction mixture of an isocyanate component and a polyol component containing at least one long difunctional polyol having a molecular weight between 500 and 10,000, containing at least partial ethylene oxide segments, with the percentage by weight of ethylene oxide segments relative to the total weight of the polyurethane being greater than 20%, at least one short diol as chain extender, with the ratio of free NCO groups of the isocyanate component to free OH groups of the polyol component being between the 1.5 and 2;
contacting the exposed surface of the applied material intended to face toward the outside of the safety glass with a surface treatment compound of an acrylic derivative or isocyante having a functionality greater than 2;
polymerizing the materials of the applied reaction mixture and the surface treatment compound; and
removing the polymerized polyurethane layer and the attached polymerized surface material from said substrate. PG,27
1 Assignment
0 Petitions
Accused Products
Abstract
A polyurethane film of excellent optical quality is prepared by applying to a substrate, by reactive casting or reactive spraying, a reaction mixture of an isocyanate component and a polyol component containing at least one long difunctional polyol having a molecular weight between 500 to 10,000, containing at least partial ethylene oxide segments, with the percentage by weight of ethylene oxide segments relative to the total weight of the polyurethane being greater than 20%, at least one short diol as chain extender, with the ratio of free NCO groups of the isocyanate component to free OH groups of the polyol component being between 1.5 and 2; and contacting a surface of said applied material intended to face toward the outside of the safety glass with a surface treatment compound of an acrylic derivative or isocyanate having a functionality greater than 2.
29 Citations
16 Claims
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1. A process of producing a transparent polyurethane film of high optical quality which is a useful component of safety glass as an external film, having energy-absorbing properties and whose scratch-resistance and abrasion resistance is improved by surface treatment, which comprises:
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applying onto an exposed surface of a substrate, by reactive casting or reactive spraying, a reaction mixture of an isocyanate component and a polyol component containing at least one long difunctional polyol having a molecular weight between 500 and 10,000, containing at least partial ethylene oxide segments, with the percentage by weight of ethylene oxide segments relative to the total weight of the polyurethane being greater than 20%, at least one short diol as chain extender, with the ratio of free NCO groups of the isocyanate component to free OH groups of the polyol component being between the 1.5 and 2; contacting the exposed surface of the applied material intended to face toward the outside of the safety glass with a surface treatment compound of an acrylic derivative or isocyante having a functionality greater than 2; polymerizing the materials of the applied reaction mixture and the surface treatment compound; and removing the polymerized polyurethane layer and the attached polymerized surface material from said substrate. PG,27 - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification