Urethane urea acrylic cast sheet materials

Abstract

Urethane-urea-acrylic cast sheet materials are made from a reaction product of components including polyisocyanate compound having at least two isocyanate functional groups and optional polyol (or pre-reacted urethane prepolymer having at least two isocyanate functional groups), curative having at least two amine functional groups, acrylic monomer, and optional multifunctional monomer having a first functional group having an active hydrogen and a second functional group having at least one double bond. The urethane-urea-acrylic cast sheet materials exhibit excellent impact properties and desirable hardness while also maintaining optical properties such as low haze that can be comparable to that of conventional cast acrylic sheet.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to U.S. Patent Application No. 62 / 425,901, "URETHANE UREA ACRYLIC CAST SHEET MATERIALS," filed November 23, 2016, which is incorporated herein by reference in its entirety . technical field [0003] This invention relates to urethane-urea-acrylic cast sheet materials. These cast sheet materials exhibit excellent impact properties and the required hardness, while maintaining optical properties such as low haze that are comparable to conventional acrylic cast sheets. Background technique [0004] There is currently a need for impact resistant transparent plastic sheets for certain applications such as ballistic safety panels, shields, face shields and other security and personal protective equipment. Such panels are typically formed by laminating or co-bonding acrylic, polycarbonate and glass layers with polyurethane or polyvinyl butyral interlayers, for example by thermal lamination using a...

AI Technical Summary

Problems solved by technology

This trade-off between impact resistance and stiffness is unacceptable for many applications such as large free-standing panels for security purposes

Therefore, the use of the urethane vinyl copolymers disclosed in WO'957 does not allow to obtain cast sheets having both excellent impact resistance and the desired hardness while maintaining the desired optical properties such as low haze

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