| 摘要 |
<p>This application discloses a core/shell latex thermal adhesive comprising a thermally softenable polymeric shell having a Tg of greater than 20 <0>C and a thermally softenable, crosslinked polymeric core having a Tg of less than 20<0>C, the difference between the Tg of the core and the shell being at least 10<0>C. This application also discloses a thermally activated adhesive composition comprising: a) from about 50 to 100 parts of a transparent film-forming core/shell latex polymer, wherein the ratio of core to shell of said core/shell latex polymer ranges from about 20/80 to about 80/20, the shell having a Tg above 20<0>C and the core having a Tg below 20<0>C with the core having a Tg lower than the Tg of the shell by at least 10 <0>C; b) from about 0 to about 15 parts inorganic, wax or polymeric particles; c) from zero to about fifteen percent of optical brightening agents; d) from zero to fifteen percent ultraviolet radiation absorbers; e) and from 0 to 40% by weight non-core-shell polymeric latex, the total of b), c), d), and e) being less than fifty percent.</p> |
