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Shape memory styrene copolymer

A memory polymer, styrene technology, used in eye implants, instruments, other household appliances, etc.

Inactive Publication Date: 2006-09-20
JOHNSON & JOHNSON VISION CARE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In conclusion, the prior art shape memory polymers were not intended to meet the specific needs associated with efficient handling of contact lens molds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A polymerization mixture was prepared by mixing vinyl neodecanoate (7%), divinylbenzene (1%), and styrene (90%) in any order to produce a clear solution. Benzoyl peroxide (2%) was then added to the resulting solution (all component % are by weight). Store the resulting solution in the refrigerator until use. To prepare the shape memory polymer (SMP), the reaction mixture prepared above was injected with a syringe into a mold prepared with two 14"x14" glass plates separated by a Viton spacer. The two glass plates are then clamped together along the edges with clamps. The Viton gasket also acts as a seal in the mold. The sample was then heated for 24 hours in an oven maintained at atmospheric pressure and a temperature of 75°C. After curing the sample for the specified time, remove it from the oven and immediately transfer it to a warm water bath. The temperature of the water used was about 60°C. The formed SMP sheet was demolded in the warm water by applying slight ...

Embodiment 2

[0042] A polymerization mixture was prepared by mixing vinyl neodecanoate (7%), divinylbenzene (1%), and styrene (60%) in any order to give a colorless solution. Polystyrene particles (30%) were then added to the resulting solution. The resulting mixture was then left at room temperature with occasional stirring until all the polystyrene particles were dissolved to give a clear viscous solution. Benzoyl peroxide (2%) was then added to the resulting solution (all component % are by weight). The resulting mixture was sonicated at room temperature for 15 minutes to give a clear solution. The resulting solution was refrigerated until use. To prepare the shape memory polymer (SMP), the reaction mixture prepared above was injected with a syringe into a mold prepared with two 14"x14" glass plates separated by a Viton spacer. The two glass pieces are then clamped together along the edges with clamps. The Viton gasket also acts as a seal in the mold. The sample was then heated for...

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PUM

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Abstract

A shape memory polymer which is a reaction product of styrene, a vinyl compound, a multifunctional crosslinking agent and an initiator. The shape memory polymer has particular application as a contact lens mold.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to provisional application Serial No. 60 / 263,968, filed January 24, 2001, which is hereby incorporated by reference in its entirety. 1. Technical field [0003] The present invention relates to a shape-memory polymer comprising a reaction product of styrene, a vinyl compound, a multifunctional crosslinking agent and an initiator. More particularly, the present invention relates to shape memory polymer thermoset resins having compatibility with polymers for contact lenses and thus having particular utility as contact lens molds in contact lens manufacture. 2. Background technology [0004] The use of contact lenses has grown rapidly in recent years. This has led to a gradual increase in the development of corresponding contact lens manufacturing capabilities. Developments in manufacturing have resulted in the development of manufacturing capabilities resulting from improvements in many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08G02C7/02A61F2/16B29C33/38B29C45/00B29C61/06B29D11/00B29L11/00
CPCB29D11/00125B29K2101/10B29D11/0048B29K2995/0073B29D11/00432B29D11/00221B29C61/0608B29C61/06B29C45/0001B29C33/38C08F212/08B29D11/00557B29D11/00548B29D11/00
Inventor T·H·童
Owner JOHNSON & JOHNSON VISION CARE INC