公开(公告)号：US4584355A

公开(公告)日：1986-04-22

申请号：US665805

申请日：1984-10-29

Applicant: John D. Blizzard ,  Dipak Narula

Inventor： John D. Blizzard ,  Dipak Narula

IPC: C08L83/04 ,  C08G77/42 ,  C08G77/44 ,  C09J183/00 ,  C09J183/10 ,  C08L83/06

CPC classification number: C09J183/10 ,  C08G77/44

Abstract: This invention relates to silicone pressure-sensitive adhesives having improved viscosity stability, film physical property stability upon aging and lap shear stability (hold time) made by a method comprising the condensation of a benzene-soluble resin copolymer of 0.6 to 0.9 triorganosiloxy units per SiO.sub.4/2 unit which contains silicon-bonded hydroxyl radicals and a polydiorganosiloxane preferably containing silicon-bonded hydroxyl or other hydrolyzable endblocking radicals with a sufficient amount of an ammonia releasing endblocking agent containing endblocking triorganosilyl units such as hexamethyldisilazane to result in a 1:0.8 to 1:3 mole ratio of silicon-bonded hydroxyl radicals and hydrolyzable endblocking radicals to total moles of triorganosilyl units provided by the endblocking agent. The condensation is conducted with heating at 80.degree. C.-160.degree. C. in the presence of 0.5 to 10 moles of water per mole of .dbd.NH present in the endblocking agent and, when necessary, in the presence of an effective amount of an organic solvent such as xylene. Condensation is preferably conducted under solvent reflux conditions. When the condensation reaction is substantially complete, the remaining endblocking agent, water and ammonia released by the endblocking agent is stripped from the composition.

Abstract translation: 本发明涉及具有改进的粘度稳定性，老化时的薄膜物理性能稳定性和搭接剪切稳定性（保持时间）的硅氧烷压敏粘合剂，该方法包括使每0.6 SiO 3的有机溶剂树脂共聚物为0.6至0.9的三有机甲硅烷氧基单元 / 2单元，其含有硅键合的羟基自由基和优选含有硅键合的羟基或其它可水解端基自由基的聚二有机硅氧烷，其含有足量的含有封端的三有机甲硅烷基单元如六甲基二硅氮烷的氨释放封端剂，得到1:0.8至1 硅键合的羟基自由基和可水解封端基团的3摩尔比与由封端剂提供的三有机甲硅烷基单元的总摩尔比。 在封端剂中每摩尔= NH存在0.5至10摩尔水的情况下，在80℃-160℃下加热进行缩合，必要时，在有效量的 有机溶剂如二甲苯。 缩合优选在溶剂回流条件下进行。 当缩合反应基本上完成时，由封端剂释放的剩余封端剂，水和氨从组合物中剥离。

公开(公告)号：US4255316A

公开(公告)日：1981-03-10

申请号：US33353

申请日：1979-04-26

Applicant: John D. Blizzard

Inventor： John D. Blizzard

IPC: C08L83/00 ,  C04B37/00 ,  C08G77/32 ,  C08K3/00 ,  C08L83/04 ,  C09J153/00 ,  C09J183/04 ,  C08L83/06 ,  C04B35/14

CPC classification number: C08G77/32 ,  C09J183/04

Abstract: Ceramifiable silicone adhesives having tack and green strength are provided by mixing a ceramifiable filler with certain silicone pressure-sensitive adhesives. The silicone pressure-sensitive adhesive comprises approximately equal weights, plus or minus five percent, of a polydiorganosiloxane having a viscosity of from 1 to 1000 Pa.multidot.s and a xylene-soluble resin copolymer of R.sub.3 SiO.sub.1/2 siloxane units and SiO.sub.4/2 siloxane units. High loadings (80 weight percent of the ceramifiale adhesive) of ceramifiable filler are attainable without loss of tack and green strength when the polydiorganosiloxane is a mixture of a low-viscosity fluid and a high-viscosity fluid. These ceramifiable silicone adhesives are useful for assembling and adhering a plurality of ceramifiable greenware components to form a ceramifiable composite greenware article.

Abstract translation: 通过将可陶瓷填料与某些硅氧烷压敏粘合剂混合来提供具有粘性和生坯强度的可陶瓷硅氧烷粘合剂。 硅氧烷压敏粘合剂包括粘度为1至1000Pax的聚二有机硅氧烷和R3SiO1 / 2硅氧烷单元和SiO4 / 2硅氧烷单元的二甲苯可溶性树脂共聚物的重量相等或重量百分比为5％。 当聚二有机硅氧烷是低粘度流体和高粘度流体的混合物时，能够获得可承载填料的高负荷（80重量％的陶瓷粘合剂）而不损失粘性和生坯强度。 这些可陶瓷的硅氧烷粘合剂可用于组装和粘附多个可陶瓷的绿色零件以形成可陶瓷的复合绿色制品。