Thermally crosslinking polyacrylates and process for their preparation
A polyacrylate, thermal cross-linking technology, applied in the field of polymers, to achieve the effect of outstanding cross-linking distribution
Active Publication Date: 2013-08-07
TESA SE
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[0021] Because the crosslinking is initiated using UV rays, the resulting disadvantages are the same as those described above
Method used
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preparation example Construction
[0241] Described below is the preparation of the starting polymers. The polymers studied are conventionally prepared in solution by free-radical addition polymerization.
[0242]
[0243] A conventional reactor for free radical polymerization was charged with 45 kg of 2-ethylhexyl acrylate, 45 kg of n-butyl acrylate, 5 kg of methyl acrylate, 5 kg of acrylic acid and 66 kg of acetone / isopropanol (92.5:7.5) . After nitrogen was purged into the reactor for 45 minutes with stirring, the reactor was heated to 58°C and 50 g of AIBN was added. Subsequently, the external heating bath was heated to 75° C. and the reaction was allowed to proceed constantly at this external temperature. After 1 hour, a further 50 g of AIBN were added, and after 4 hours the batch was diluted with 20 kg of an acetone / isopropanol mixture.
[0244] After 5 hours and again after 7 hours, reinitiation was carried out with 150 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate in each case. After 22 hours...
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Abstract
Producing homogenous crosslinked polymers, comprises: adding at least a crosslinker to polymer melts; further processing the polymer melts; and subjecting to a thermal crosslinking reaction using the crosslinker, where at least a part of the crosslinking reaction takes place after further processing at a temperature below the melting temperature of the polymer, the crosslinker comprises at least a crosslinking bifunctional compound, and the functional group is at least an oxazoline group. Producing homogenous crosslinked polymers, comprises: adding at least a crosslinker to polymer melts; further processing the polymer melts; and subjecting to a thermal crosslinking reaction using the crosslinker, where at least a part of the crosslinking reaction takes place after further processing at a temperature below the melting temperature of the polymer, the crosslinker comprises at least a crosslinking bifunctional compound, the functional group is at least an oxazoline group, and the polymer exhibits a functional group that is reacted at a temperature below the melting temperature of the polymer with the oxazolines in terms of a coupling reaction in the sense of the thermal crosslinking reaction. An independent claim is included for homogenous crosslinked, emulsifier-free polymers, obtained by the above process.
Description
technical field [0001] The invention relates to a process for thermally crosslinking polymers, in particular polyacrylates, to thermally crosslinking and to crosslinked polymers produced by said thermally crosslinking. Background technique [0002] For high-end industrial applications, more specifically including applications as adhesives, pressure-sensitive adhesives or heat-sealing compositions, the ingredients used include polyacrylates, polymers that are well suited to the growing demands in these fields of application And stand out. [0003] Therefore, adhesive compounds are required to have a good tack, but must also meet stringent requirements in terms of shear strength. At the same time, good processability must also be present, including in particular a high suitability for coating these compositions onto backing materials. In particular, this is achieved by polyacrylates having a high molecular weight, high polarity and subsequent efficient crosslinking. Further...
Claims
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IPC IPC(8): C08J3/24C08L33/08C08L33/10C08K5/353C09J133/08C09J133/10
CPCC08J3/247C09J2201/61C08J2333/08C09J133/08C09J2301/304C08J3/24C08K5/09C08K5/353C08L33/08
Inventor 诺伯特·格里特纳斯文·汉森亚历山大·普伦泽尔斯蒂芬·佐尔纳
Owner TESA SE