Acrylic vacuum bonding

Small amounts of acrylic adhesives are utilized by automotive manufacturers, the largest application being headliners. This application, which consists of polystyrene board bonded with acrylic adhesives, is being replaced by fiberglass headliners bonded with SBR acrylics. Another outlet for acrylics is bonding vacuum-formed parts. 

Poly(acrylates) and (alkyl acrylates) - Fluorinated acrylics are inherently photostable while the vacuum UV photolysis of PMMA results in de-esterification and double bond formation ". The stereostructure of PMMA also has an important influence on the product distribution. X-Ray and UV exposure of PMMA was fingerprinted via FT NMR analysis. ... 

In densely crosslinked dimethacrylates, radicals with lifetimes of several days have been observed and the lifetimes were found to depend on crosslink density Extremely long lifetimes at room temperature have been observed with photopoly-merized di(meth)acrylates In the case of photopolymerized HDDA and HEBDM, the lifetimes exceeded 5 months at room temperature and under vacuum, even in the presence of large amormts of unreacted monomer and pendent double bonds. 

The US Techni-Met Inc., has developed a process which may benefit some electronic applications where surface quality is paramount. The process involves the use of vacuum-sputtering technology and an acrylic monomer to lay down an acrylic polymer surface on film. The acrylic bonds to the film substrate by crosslinking and suitable films for the process include PET, PEN, PVC and polyimide. The company claims that its process confers superior water, oxygen and optical properties. 

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