Polyurethane compositions having improved impact resistance and optical properties

A composition, polyurethane technology, applied in the field of polyurethane and related compositions, which can solve the problems of insufficient optical properties, poor solvent resistance and scratch resistance, unacceptable impact strength and crack resistance, etc.

Inactive Publication Date: 2013-02-06
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, diethylene glycol bis(allyl carbonate), polymethyl methacrylate resins, and polystyrene resins have unacceptable impact strength and crack resistance, although polycarbonate resins sometimes exhibit better impact strength and crack resistance, but it also suffers from insufficient optical properties and poor chemical, solvent and scratch resistance

Method used

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  • Polyurethane compositions having improved impact resistance and optical properties
  • Polyurethane compositions having improved impact resistance and optical properties
  • Polyurethane compositions having improved impact resistance and optical properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Combine, melt and mix well the following: 36.05 grams (g) TONE TM 32B8, 6.83gTONE TM 32C8, 10.63g TONE TM 1278 and 0.58 g trimethylolpropane. This mixture was then added slowly to a three-necked glass flask containing 45.90 g of isocyanate 2 with stirring. Then, the reactor temperature was slowly raised to 90 degrees Celsius (° C.), and the reaction was maintained at 90° C. for 6 hours under a dry nitrogen atmosphere. Finally, the reaction product was a prepolymer with an NCO content of 10.75%.

[0087] Then, the prepolymer reaction product was degassed and cooled to 65°C-70°C, and 100g of the product was mixed with 21.62g of ETHACURE TM 100LC was mixed in a speed mixer for 30 seconds, then poured into molds preheated to 115°C. This forms a sample sheet with a thickness of 3 mm. Then, the mold was placed in an oven set at 115°C. After curing at 115°C for 10 minutes, the sample piece was removed from the mold and post-cured at 115°C for an additional 16 hours....

Embodiment 2

[0090] The prepolymer prepared by another 100g embodiment 1 and 45.45g LONZACURE TM The MCDEA was mixed and then melted on a speed mixer at 100°C for 30 seconds and poured into molds which had been preheated at 130°C. This forms a sample sheet with a thickness of 3 mm. Then, the mold was placed in an oven set at 130°C. After curing at 130°C for 30 minutes, the sample piece was removed from the mold and post-cured at 130°C for an additional 16 hours.

[0091] Then, the sample sheet was kept at room temperature for 7 to 10 days before being subjected to haze, light transmittance, and impact resistance tests. The results are shown in Table 1.

Embodiment 3 and 4

[0105] Examples 3 and 4, and Comparative Examples E and F

[0106] Sample Preparation

[0107] A sample of about 9 millimeters (mm) x 30 mm was cut out from the obtained 3 mm thick test piece. All samples were prepared according to the guidelines of the test method.

[0108]The samples for testing the refractive index were polished to a grit level of 1200 by sandpaper and then several grades of fine paper. The polished samples were tested for refractive index on an Atago DRM2 / 1550 Abbé refractometer at 20°C and various wavelengths. The data were fitted to the Cauchy equation using the "least squares method", and the fitted equation was then used to determine the refractive index at 656.3 nanometers (nm) for each material. Then, calculate the Abbé value for each material according to the following equation:

[0109]

[0110] where n D is the refractive index at 589nm, n C is the refractive index at 656.3nm, and n F is the refractive index at 486nm.

[0111] Using a T...

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Abstract

A thermoset polyurethane composition having excellent impact and optical properties is prepared from a formulation comprising at least a prepolymer and a chain extender. The prepolymer includes an isocyanate component, containing 1,3-bis(isocyanatomethyl)cyclohexane and at least (20) percent by weight of 1,4-bis(isocyanatomethyl)cyclohexane, and an isocyanate-reactive component, containing hydroxyl, amine or thiol functionality. The isocyanate-reactive component includes from (70) to (95) percent by weight of a compound having a molecular weight from 150 to less than 950 Daltons, and from (5) to (30) percent by weight of a compound having a molecular weight from 2,000 to 4,500 Daltons. The chain extender is an aromatic, aliphatic, or cycloaliphatic polyamine compound containing at least one hydroxyl and / or thiol group. Articles that may be prepared include ophthalmic lenses, vehicle glazings, aircraft canopies, and the like.

Description

technical field [0001] This invention relates to polyurethanes and related compositions. More particularly, the present invention relates to such compositions having improved impact resistance and optical properties. Background technique [0002] Polymer compositions with high impact resistance and good optical properties are used in many applications such as architectural glazing, vehicle glazing, riot shields, aircraft canopies, face shields, sun visors, spectacle and sunglass lenses, optical lenses, protective sex glasses and transparent armor. Representative optically transparent plastic materials include diethylene glycol bis(allyl carbonate), polymethyl methacrylate resins, polystyrene resins, and polycarbonate resins. However, diethylene glycol bis(allyl carbonate), polymethyl methacrylate resins, and polystyrene resins have unacceptable impact strength and crack resistance, although polycarbonate resins sometimes exhibit better impact strength and crack resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/75
CPCC08G18/6674C08G18/757C08G18/664C08G18/12C08G18/3225
Inventor 谢瑞D.布里德P.安塞姆斯周伟俊D.巴塔查吉J.阿吉罗普洛斯
Owner DOW GLOBAL TECH LLC
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