Optical structures including polyurea
AssigneeReflexite Corporation
InventorsDzu D. Luong, Patrick W. Mullen
Life of this patent
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Abstract
Optical structures and sheeting that include polyurea and method for forming same are proposed in accordance with aspects of the present invention. One and two-component layers can be used to form the optical structures. The optical structures can include microstructures formed from polyurea. The sheeting can include at least one of cube-corner prisms, open-faced cube-corner prisms, linear prisms, lenticular lenses, moth-eye structures, lenses, Fresnel lens arrays, lenses, and fish-eye lens arrays.
Claims71
Optical sheeting including polyurea.
Optical sheeting that includes optical components disposed on a sheet that includes polyurea.
A plurality of retroreflective components that are retroreflective on a first side and on a second side, the components being dispersed in polyurea.
A structure comprising optical components dispersed in a polyurea binder.
A method for forming a sheet that includes polyurea, comprising:
- providing a carrier substrate;
- depositing polyurea on the carrier substrate;
- allowing the polyurea to at least partially cure to form the sheet that includes polyurea;
- and
- removing the carrier substrate.
A method for forming polyurea comprising:
- a) preparing a first premix by mixing trifunctional polyol with difunctional isocyanate;
- b) preparing a second premix by mixing polyfunctional isocyanate with difunctional polyol and further mixing in difunctional isocyanate;
- c) mixing the first premix with the second premix to obtain a substantially homogeneous prepolymer mixture;
- and
- d) mixing the substantially homogeneous prepolymer mixture with an amine.
A method for forming polyurea comprising:
- a) preparing a first premix by mixing trifunctional polyol with excess difunctional isocyanate to end cap substantially all hydroxyl groups;
- b) preparing a second premix by:
- i. capping polyfunctional isocyanate with difunctional polyol;
- and
- ii. end-capping the mixture in step i with excess difunctional isocyanate to convert substantially all hydroxyl groups to isocyanates;
- c) mixing the first premix with the second premix to obtain a substantially homogeneous prepolymer mixture;
- and
- d) mixing the substantially homogeneous prepolymer mixture with an amine resin to form the polyurea.
A method for forming polyurea sheeting, comprising:
- dispensing an amine resin onto a substrate;
- dispensing an isocyanate prepolymer onto the substrate;
- allowing the amine resin and the isocyanate prepolymer to at least partially diffuse into each other;
- and
- winding up the substrate after the amine resin and isocyanate prepolymer have at least partially reacted and cured to form the polymer sheeting.
A method for forming polyurea sheeting, comprising:
- providing a first substrate having a layer of isocyanate prepolymer thereon;
- providing a second substrate having a layer of amine resin thereon;
- and
- pressing the layer of isocyanate prepolymer against the layer of amine resin to at least partially mix the isocyanate prepolymer with amine resin to form the polyurea sheeting.
An optical structure having a microstructured surface on a first side and a microstructured surface on a second side, the structure including polyurea.
An optical sheet having at least one microstructured surface formed from polyurea.
A polyurea optical structure comprising a one-component polyurea layer attached to a first side of a two-component polyurea layer.
A method for forming a polyurea optical structure, comprising:
- providing a one-component polyurea layer on a carrier substrate;
- providing a two-component polyurea layer on the one-component polyurea layer, the two-component polyurea layer contacting the one-component polyurea along a first side of the two component polyurea layer;
- providing a one-component polyurea layer on a second side of the two-component polyurea layer;
- and
- providing a layer on the one-component polyurea that is provided on the second side of the two-component polyurea layer.
A method for forming a polyurea optical structure, comprising:
- providing a one-component polyurea layer on a carrier substrate;
- providing a two-component polyurea layer on the one-component polyurea layer, the two-component polyurea layer contacting the one-component polyurea along a first side of the two-component polyurea layer;
- and
- providing a layer on a second side of the two-component polyurea layer.
A polyurea optical structure comprising a two-component polyurea layer attached along a first side of the two-component polyurea layer to a microstructured layer.
Dependencies are inferred from the claim text.