MOLD MATERIAL CONTAINING ADDITIVES

Japanese Patent JP3764778

B2

PROBLEM TO BE SOLVED: To reduce the bonding strength of a hydrophilic polymer article with the surface of a mold by forming a cavity from a mold material prepared by adding an internal release agent or a surfactant to a thermoplastic polymer and a molding resin comprising either one of polystyrene and polypropylene as an additive.
SOLUTION: A projected surface 33 and a recessed surface 34 requires optically smooth quality. A mold material is infiltrated in a thermoplastic polymer and a thermoplastic material comprising polystyrene or polypropylene and contains about 0.1-20 wt.% of an internal additive. The additive is polyethylene or polypropylene wax with a mol.wt. of about 5,000-200,000, stearate, gycerol ester with a mol.wt. of about 200-2,000, amide wax represented by formula R1CONH2, silicone with a mol.wt. of about 2,000-100,000, Montan wax, oxidized wax, fatty acid with a mol.wt. of about 200-2,000, complex ester or a combination of them.

Toure Kint-Larsen
Jeffrey Longo
Keith O'Brien

JP10333996A

April 12, 2006

March 29, 1996

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JOHNSON & JOHNSON VISION PRODUCTS INCORPORATED

B29C33/40; G02C7/04; B29C33/64; B29D11/00; C08K5/00; C08L23/10; C08L23/12; C08L25/04; C08L25/06; B29C33/60; B29C35/08; B29C39/00; B29K23/00; B29K55/00; B29K91/00; B29L11/00; C08L23/00; C08L83/04; C08L91/06; (IPC1-7): B29C33/40; G02C7/04; //B29K23:00; B29K55:00; B29K91:00; B29L11:00

JP3089314A
JP57189116A
JP6170857A

US4983332
US4640489
US4159292

プラスチックおよびゴム用添加剤実用便覧,日本,株式会社化学工業社,1970年 8月10日,945-951
便覧 ゴム・プラスチック配合薬品 新訂版,日本,株式会社ラバーダイジェスト社,2001年 4月27日,289-303

Heikichi Odashima

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