| abstract |
Method for in situ release into a matrix of modifying reagent by exposure of selectively responsive means to electromagnetic radiation using a composition comprising a modifiable matrix and means selectively releasing aliquot portions of modifier distributively through the matrix, the means comprising microcapsules containing a matrix-modifying effective amount of the modifier portions out of matrix contact and releasably in electromagnetic radiation-responsive relation, whereby the matrix is modified by contact with the modifier upon composition exposure to electromagnetic radiation. |