| 摘要 |
<p>The invention provides a water-based adhesive composition comprising a blend of adhesive polymers in an aqueous system, characterised in that the blend of adhesive polymers is: 20-60 % by weight of an acrylic polymer having a polarity balance expressed as water absorption according to DIN 53495 of 3 to 20 %; and correspondingly 40-80 % by weight of a compatible tackifying resin having a degree of hydrophobicity measured as the contact angle between a dried film of the resin and a drop of distilled water of not less than 60°; the percentages being based on the total of acrylic polymer plus tackifying resin expressed as dry solids. The composition shows good bond retention when wet and can be used for bonding polar substrates such as cellulose and non-polar substrates such as polyolefin. When used to bond a water absorbing substrate such as cellulose, the adhesive should have a viscosity of 200 mPas or less. The adhesive is particularly suitable for use in the manufacture of absorbent pads such as diapers and sanitary napkins.</p> |
