Abstract: The present application relates to a process for preparing dyed plastics or polymeric dye particles characterized in that it comprises mixing a high molecular weight organic material with a coloristically effective amount of at least one dye of the formula where R1 is hydrogen, hydroxyl or a radical —NHCO—R6, where R6 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halogen-substituted phenyl, R2 is hydrogen, hydroxyl or a radical W—R7, where W is —NHCO— or —S— and R7 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halogen-substituted phenyl, R3 is hydrogen, R4 is hydrogen or hydroxyl, R5 is hydrogen, or R3 and R4 combine to form the radical of the formula, where the rings A and B may independently bear further substituents.

Abstract: A cushioning mattress is provided to normalize and distribute the weight of a patient's body to reduce the tangential forces bearing on the skin of the patient. The cushioning mattress comprises a top surface, a bottom surface and a series of alternating "tunnel" billows and "loop" billows. Each tunnel billow comprises a separate piece of material affixed to the top or bottom surface along two parallel seams to define a wide-based closed cell. Each loop billow comprises a separate piece of material affixed to the top or bottom surface along a single seam to define a narrow-based closed. Each tunnel and loop billow contains a visco-elastic material capable of conforming to any surface which it engages.