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Scanned, pulsed electron-beam polymerization

An electron beam, polymerizing monomer technology, applied in the field of polymerization, can solve the problems of low conversion rate, short residence time and short chain length of polymers, and achieve the effects of short residence time, high conversion value and high conversion rate

Inactive Publication Date: 2014-02-05
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the very high dose rates and short residence times generally required during continuous polymerization on a web coated with a polymerizable material tend to result in low Conversion and short chain length

Method used

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  • Scanned, pulsed electron-beam polymerization
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  • Scanned, pulsed electron-beam polymerization

Examples

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example

[0255] The following examples are intended to illustrate exemplary embodiments within the scope of the invention. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

[0256] test program

[0257] The following tests were used to evaluate the polymeric compositions of the present invention.

[0258] Conversion rates

[0259] Will be a 14.5cm 2 (1.5 x 1.5 in2) samples we...

example 1-

[0286] Example 1 - Pressure Sensitive Adhesive

[0287] Pressure-sensitive adhesive samples were prepared by scanning pulsed electron beam irradiation with paste A at a temperature of 0 °C. Each sample was coated to a thickness of approximately 1 mil (25 microns thick) using a Meyer rod and sandwiched between two layers of 1 mil (25 microns thick) polyethylene terephthalate film (PET) between.

[0288] The percent conversion and percent gel were measured for each coated sample. Example 1 shows the effect of dose per exposure duration on the total dose required to obtain an extrapolated conversion rate of at least 90%, and more preferably at least about 95% or higher (e.g., 94.4% to 99.7%) . Example 1 also shows that the dose for each duration of exposure contributes to obtaining at least about 80%, more preferably at least about 90%, or even at least about 95% (e.g., 97-99.1%) but preferably less than 100% of the extrapolated coagulation. Effect of the total dose require...

example 2

[0295] Example 2 - Silicone Crosslinking

[0296] The sample conditions described above were also used to crosslink non-functionalized PDMS (OHX-4070, 50,000 centistokes) coated on PET to a thickness of 3 mils (75 microns). Table 2 summarizes the experimental conditions and results (percent gel) for crosslinking.

[0297]

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Abstract

A method including: a. coating at least a portion of at least one major surface of a substrate with a polymerizable composition to obtain a coated surface; b. initiating polymerization of the polymerizable composition by scanning a first electron-beam focused on the coated surface across at least a portion of the coated surface, thereby irradiating the coated surface at a frequency selected to achieve an exposure duration of greater than 0 and no greater than 10 microseconds, and a dark time between each exposure duration of at least one millisecond, thereby producing an at least partially polymerized composition. A pressure sensitive adhesive article and a cross-linked silicone release liner made according to the method are also disclosed.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application Serial No. 61 / 490,721, filed May 27, 2011, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention generally relates to polymerization processes. More specifically, the present invention relates to a polymerization method in which monomers and / or oligomers on the surface of a substrate are polymerized by utilizing pulses of accelerated electrons from a rapidly scanning electron beam. Background technique [0004] Electron beams are known in the art (see, eg, US Patent Nos. 2,810,933; No. 5,414,267; No. 6,038,015; No. 7,256,139; and No. 7,348,555). Electron beams work by bombarding molecules with electrons. These electrons displace other electrons in the bombarded molecule, creating free radicals that can react with other molecules. Electron beam radiation produces a large number of free...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08J7/18C08J3/28C08F2/46C08J5/00
CPCC08F2/54B05D2252/04B05D3/068B05D2502/00Y10T428/2852C09J133/06C09D133/10C09J133/10
Inventor 卡尔·B·里赫特道格拉斯·S·邓恩道格拉斯·E·韦斯
Owner 3M INNOVATIVE PROPERTIES CO
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