Patent ID: 7192653

Claim:
A prepreg which can be produced by impregnating a base paper with a heat-curing resin free from formaldehyde characterized in that after drying the prepreg has a residual moisture content of 2 to about 3% by weight, after drying of the prepreg the resin of the prepreg is thermoplastic and during the further processing of the dried prepreg as a result of a temperature effect is crosslinkable to a polymer with thermosetting properties and the resin is a polymer which contains at least one polymer obtainable by radical polymerisation, which polymer contains less than 5% by weight of an α,β-ethylenically unsaturated mono or dicarboxylic acid in the polymerised state, contains at least one polymer obtainable by radical polymerisation, which polymer contains more than 15% by weight of an α,β-ethylenically unsaturated mono or dicarboxylic acid in the polymerised state, and contains at least one alkanolamine with at least two hydroxyl groups or the resin is a polymer which contains at least one polymer obtainable by radical polymerisation, which polymer contains up to 5 to 100% by weight of an α,β-ethylenically unsaturated mono or dicarboxylic acid in the polymerised state, and at least one alkanolamine with at least two hydroxyl groups.