Do you have an adhesives-related question? Send it to Dr. David Dunn, a technical consultant. His broad knowledge of the industry has helped hundreds of people. He may just have the answer you're looking for to help your business.
First, you should remember that your rigid PVC does not contain plasticizers, so it should not be an issue. The issues concerning certain plasticizers in flexible PVC have not been totally resolved, with some scientific evidence indicating potential problems and other evidence actually showing benefits from the plasticizers. However, many companies are taking a conservative proactive approach like yours and looking for alternatives. For certain applications, polyethylene and polypropylene can be used. In others, thermoplastic elastomers have been shown to be suitable. None of these plastics combines all the properties and low cost of flexible PVC and they are often more difficult to assemble.