Polymers containing -methylenelact(ones)(ams) such as -methylenebutyrolactones are useful in blends with other polymers. For examples such polymers which have reactive groups are toughened by mixing with a rubbery material which has complimentary reactive groups, or polymers containing repeat units derived from -methylenelact(ones)(ams) are toughened by mixing with polymeric core-shell particles having an elastomeric core and a specified thermoplastic shell. The properties of thermoplastics are also improved by blending with -methylenelact(ones)(ams) such as -methylenebutyrolactones containing (co)polymers.

 
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