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Polymeric molds and articles made therefrom

A polymer and molded product technology, applied in the field of polymer molds, can solve the problems of difficult and time-consuming demolding of molded products

Inactive Publication Date: 2011-07-13
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicone rubber tends to have high oxygen solubility, which may undesirably lead to inhibition of the free radical curing reaction used to make molded articles from silicone rubber molds
If the molded article is prepared by curing the silicone material in a silicone rubber mold, the adhesion between the two silicone substances may cause difficulty in releasing the molded article
Additionally, curing of silicone materials typically takes hours, so making multiple polymer molds from a single master tool can be very time consuming
A particular disadvantage of polyurethane-based molds is that demoulding of molded parts is often relatively difficult, especially when no mold release agents are used

Method used

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  • Polymeric molds and articles made therefrom
  • Polymeric molds and articles made therefrom
  • Polymeric molds and articles made therefrom

Examples

Experimental program
Comparison scheme
Effect test

example

[0057] All materials were obtained from Aldrich Chemicals (Milwaukee, WI) unless otherwise specified.

[0058] testing method

[0059] Tensile strength (ASTM D638)

[0060] The 1 / 8 inch thick samples were cut into dog bone shaped samples having the dimensions specified in ASTM D638 (Type IV). Tensile strength was measured by testing samples to failure on a Sintech load frame with an initial grip spacing of 3.5 inches and a test speed of 20 inches / minute. To measure elongation, dog bone shaped samples were tested with an initial grip spacing of 1.25 inches and a test speed of 20 inches / minute. Elongation is based on the spacing of the clamps. Marks were added to the samples to identify any slippage in the fixture during the test and any observed slippage was taken into account after the test.

[0061] Tear Strength (ASTM D624)

[0062] Die B was used to cut 1 / 8 inch thick samples into crescent-shaped tear samples as described in ASTM D624. The sample was also notche...

preparation example 1

[0064] Preparation example 1. MeFBSE-norbornene (fluorinated monomer 1)

[0065] Will C 4 f 9 N(CH 3 )CH 2 CH 2 OC(O)CH=CH 2 [121.78 g, 0.296 mol, prepared as described in Parts A and B of Example 2 of WO 01 / 30873A1 (Savu et al.)], cyclopentadiene (23.36 g, 0.353 mol, freshly prepared from dicyclopentadiene) and chloroform (120 mL) of the mixture was mixed at room temperature for 10 minutes. The solution was then heated to 55°C for 20 hours. The mixture was then placed under vacuum to remove solvent. The product was obtained as a waxy solid (yield 140.16 g, 97%).

[0066] Preparation 2.5-norbornene-2-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-octyl) ester (Fluorinated monomer 2)

[0067] 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl acrylate (25.00 g, 60 mmol) and cyclopentadiene (4.78 g , 72 mmol, freshly prepared from dicyclopentadiene) and the mixture was mixed at room temperature for 2 hours. The solution was then heated to 55°C for 17 hours. The mixture was...

preparation example 3

[0068] Preparation Example 3: Preparation of W Catalyst Solution

[0069] Charge an oven-dried 1 L flask with WCl under nitrogen 6(4.00 g, 0.010 mol), nonylphenol (2.24 g, 0.010 mol) and about 100 ml of anhydrous toluene. The mixture was stirred for four hours while purging with nitrogen. Anhydrous dicyclopentadiene (DCPD, 500 mL, 3.67 mol) and 2,4-pentanedione (2.0 g, 0.020 mol) were then added. The solution was placed under vacuum and stirred at 40°C for 2.5 hours to remove the toluene. Anhydrous DCPD was added to bring the total volume to 500 mL.

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Abstract

Disclosed herein are polymeric molds that can be used to make molded articles. The polymeric molds are made from cyclic olefin polymers that may be formed by ring opening metathesis polymerization (ROMP) of a polycyclic monomer having two or more reactive double bonds and a cyclic monomer comprising one reactive double bond. Fluorinated monomers may be used. The polymeric molds may be structured molds in that they have at least one microstructured feature having a dimension of less than about 2 mm, or less than about 500 um. The polymeric molds may also have a plurality of such microstructured features. Also disclosed herein are methods of making the polymeric molds, methods of making molded articles therefrom, and the molded articles.

Description

[0001] Cross references to related patent applications [0002] This application is related to commonly assigned, co-pending U.S. Patent Application Serial No. 61 / 074,428 (Rule et al.), entitled "Molded Microstructured Articles," filed on the same date as this application . technical field [0003] This application relates to polymer molds, and in particular to polymer molds made from cyclic olefin polymers. Polymer molds can be used to make molded articles with microstructured features. Background technique [0004] Polymer molds are usually made of silicone rubber and polyurethane rubber. Silicone rubbers tend to have high oxygen solubility, which may undesirably lead to inhibition of free radical curing reactions for making molded articles from silicone rubber molds. If a molded article is prepared by curing a silicone resin material in a silicone rubber mold, the adhesion between the two silicon substances may cause difficulty in releasing the molded article. Additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/40C08F32/08C08J5/00C08F232/08
CPCB29C33/3857C08G61/08C08G2261/3324C08G2261/146C08G2261/418B29C33/40C08G2261/3325C08F232/08B29C33/424C08G2261/1426C08G2261/143C08F32/08C08J5/00
Inventor 约瑟夫·D·鲁莱凯文·M·莱万多夫斯基
Owner 3M INNOVATIVE PROPERTIES CO
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