Method for producing liquid crystal display cell and sealing agent for liquid crystal display cell

Abstract

A method for producing a liquid crystal display cell comprising processes of applying a sealing agent on a sealing portion of at least one liquid crystal display cell substrate, dropping liquid crystal on the substrate, and bonding substrates to each other under vacuum, wherein the sealing agent comprising a material to be cured and a curing agent is applied to the sealing portion without mixing the material to be cured and the curing agent, and then the substrates are bonded to each other under vacuum at room temperature to cure the sealing agent, is disclosed. A sealing agent for a liquid crystal display cell wherein the above material to be cured comprise a radically polymerizable resin and an organic peroxide, and the above curing agent comprises a radically polymerizable resin and a decomposition accelerator, is also disclosed.

1 . A method for producing a liquid crystal display cell comprising processes of applying a sealing agent to a sealing portion of at least one liquid crystal display cell substrate, dropping liquid crystal on the substrate, and bonding substrates to each other under vacuum, wherein the sealing agent comprising a material to be cured and a curing agent is applied to the sealing portion without mixing the material to be cured and the curing agent, and then the substrates are bonded to each other under vacuum at room temperature to cure the sealing agent.  
     
     
         2 . A sealing agent for a liquid crystal display cell wherein the material to be cured comprises a) a radically polymerizable resin and b) an organic peroxide, and the curing agent comprises a) a radically polymerizable resin and c) a decomposition accelerator.  
     
     
         3 . The sealing agent for a liquid crystal display cell according to  claim 2 , wherein the material to be cured comprises a) 30 to 94.4 mass % of a radically polymerizable resin having polystyrene-reduced number-average molecular weight of 300 to 10000, as a radically polymerizable resin, b) 0.5 to 10 mass % of an organic peroxide having a 10 hour-half life temperature of at least 120° C., e) 5 to 50 mass % of an inorganic filler and f) 0.1 to 5 mass % of a silane coupling agent, and the curing agent comprises a) 30 to 94.4 mass % of a radically polymerizable resin having polystyrene-reduced number-average molecular weight of 300 to 10000, as a radically polymerizable resin, c) 0.5 to 10 mass % of a decomposition accelerator, e) 5 to 50 mass % of an inorganic filler and f) 0.1 to 5 mass % of a silane coupling agent, and the mass ratio of the curing agent: the material to be cured is in a range from (3:1) to (1:3).  
     
     
         4 . The sealing agent for a liquid crystal display cell according to  claim 3 , wherein a) the radically polymerizable resin is an acrylate resin having polystyrene-reduced number-average molecular weight of 300 to 10000.  
     
     
         5 . The sealing agent for a liquid crystal display cell according to  claim 3 , wherein a) the radically polymerizable resin is an allyl resin having polystyrene-reduced number-average molecular weight of 300 to 10000, and d) a polyvalent mercapto compound.  
     
     
         6 . The sealing agent for a liquid crystal display cell according to  claim 4 , wherein the material to be cured and the curing agent are each independently compounded with 5 to 25 mass % of g) a liquid rubber and/or h) a rubber fine particulate, based on the total amount.